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Thread: Speed difference between 2 PCs on same network - Please Help

  1. #1
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    Question Speed difference between 2 PCs on same network - Please Help

    Any help with this would be much appreciated. Thanks.

    I have 2 PC's hooked up to the same router and one consistently gives me half the speed of the other when speed tested. I'm wondering how this could be. I used the optimizer on the slower machine but it does not seem to have made any difference. I theoretically have a 4-10Gbit cable connection (with 384Mbit upload).

    Desktop PC
    CPU: P3 600Mhz

    SpeedGuide.net TCP Analyzer Results
    Tested on: 08.09.2008 04:44
    IP address: 82.34.xxx.xx
    TCP options string: 020405b40103030201010402
    MSS: 1460
    MTU: 1500
    TCP Window: 256960 (multiple of MSS)
    RWIN Scaling: 2
    Unscaled RWIN : 64240
    Reccomended RWINs: 64240, 128480, 256960, 513920
    BDP limit (200ms): 10278kbps (1285KBytes/s)
    BDP limit (500ms): 4111kbps (514KBytes/s)
    MTU Discovery: ON
    TTL: 50
    Timestamps: OFF
    SACKs: ON
    IP ToS: 00000000 (0)

    SpeedGuide.net Speed Test Results
    2165 kbps down (~2.17 Mbps, 264 KB/s)↓
    335 kbps up (~0.34 Mbps, 41 KB/s)↑
    2048 KB downloaded in 7.75 seconds
    500 KB uploaded in 12.234 seconds
    Tested on: 2008.08.09 04:25 EDT
    Tested from: celticsurf.net
    Test Link: http://www.speedguide.net/speedtest/...t=7SJ73C6E4Q2H
    Provider: hari.blueyonder.co.uk
    Location: London, UK

    Laptop PC
    CPU: Core 2 Duo

    SpeedGuide.net TCP Analyzer Results
    Tested on: 08.09.2008 04:07
    IP address: 82.34.xxx.xx
    TCP options string: 020405b401010402
    MSS: 1460
    MTU: 1500
    TCP Window: 65535 (NOT multiple of MSS)
    RWIN Scaling: 0
    Unscaled RWIN : 65535
    Reccomended RWINs: 64240, 128480, 256960, 513920
    BDP limit (200ms): 2621kbps (328KBytes/s)
    BDP limit (500ms): 1049kbps (131KBytes/s)
    MTU Discovery: ON
    TTL: 114
    Timestamps: OFF
    SACKs: ON
    IP ToS: 00000000 (0)

    SpeedGuide.net Speed Test Results
    3859 kbps down (~3.86 Mbps, 471 KB/s)↓
    323 kbps up (~0.32 Mbps, 39 KB/s)↑
    5120 KB downloaded in 10.87 seconds
    1024 KB uploaded in 25.994 seconds
    Tested on: 2008.08.09 04:05 EDT
    Tested from: celticsurf.net
    Test Link: http://www.speedguide.net/speedtest/...t=F91B5UXCQ3SA
    Provider: hari.blueyonder.co.uk
    Location: London, UK

    Any help with this would sure be appreciated. The laptop is so much faster for surfing that I'm finding myself using it more and more but I'd like to have the same kind of performance from the desktop one so that I can make use of a nice big TFT monitor and get back to using the laptop for what it was originally intended; a travel machine only.

    Thanks in advance for any help offered.

  2. #2
    Elite Member trogers's Avatar
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    Try the following on your PC:

    General Settings tab:
    Custom settings - check
    Modify All Network Adapters - check
    network adapter selection - your NIC
    MTU - 1500
    TTL - 64
    TCP Receive Window - 64240
    MTU Discovery - Yes
    Black Hole Detect - No
    Selective Acks - Yes
    Max Duplicate ACKs - 2
    TCP 1323 Options:
    Windows Scaling - uncheck
    Timestamps - uncheck

    Advanced Settings tab:
    Max Connections per Server - 10
    Max Connections per 1.0 Server - 20
    LocalPriority - 1
    Host Priority - 1
    DNSPriority - 1
    NetbtPriority - 1
    Lan Browsing speedup - optimized
    QoS: NonBestEffortLimit - 0
    ToS: DisableUserTOSSetting - 0
    ToS: DefaultTOSValue - 80
    MaxNegativeCacheTtl - 0
    NetFailureCacheTime - 0
    NegativeSOACache Time - 0
    LAN Request Buffer Size - 32768
    Then select "Apply Changes" and reboot to take effect
    "Contentment is not the fulfillment of what you want, but is the realisation of how much you already have" - anon

  3. #3
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    Thanks for the reply and advice.

    I did what you suggested and then did three tests. The results are below.

    The download speed seems to have increased somewhat but performance is still less than with the laptop (tested again at the same time and with roughly the same results as in my previous post). What I am concerned about however is the significant decrease in upload speed. Upload is now an average of 183 (over the three tests) and it was 335 with the previous settings. I plan to use a "SlingBox" soon and so upload speed will be important for remote viewing. For the moment I have reverted to the old settings.

    Have you any further suggestions?
    Many thanks.

    SpeedGuide.net TCP Analyzer Results
    Tested on: 08.10.2008 03:07
    IP address: 82.34.xxx.xx

    TCP options string: 020405b401010402
    MSS: 1460
    MTU: 1500
    TCP Window: 64240 (multiple of MSS)
    RWIN Scaling: 0
    Unscaled RWIN : 64240
    Reccomended RWINs: 64240, 128480, 256960, 513920
    BDP limit (200ms): 2570kbps (321KBytes/s)
    BDP limit (500ms): 1028kbps (128KBytes/s)
    MTU Discovery: ON
    TTL: 50
    Timestamps: OFF
    SACKs: ON
    IP ToS: 00000000 (0)


    SpeedGuide.net Speed Test Results
    3129 kbps down (~3.13 Mbps, 382 KB/s)↓
    171 kbps up (~0.17 Mbps, 21 KB/s)↑
    3072 KB downloaded in 8.043 seconds
    1024 KB uploaded in 49.002 seconds
    Tested on: 2008.08.10 03:09 EDT
    Tested from: celticsurf.net
    Test Link: http://www.speedguide.net/speedtest/...t=DAKQ2PGVLX62
    Location: London, UK

    SpeedGuide.net Speed Test Results
    3428 kbps down (~3.43 Mbps, 418 KB/s)↓
    188 kbps up (~0.19 Mbps, 23 KB/s)↑
    3072 KB downloaded in 7.342 seconds
    1024 KB uploaded in 44.734 seconds
    Tested on: 2008.08.10 03:11 EDT
    Tested from: celticsurf.net
    Test Link: http://www.speedguide.net/speedtest/...t=0XJHLVUISF4M
    Provider: levymccallum.com
    Location: London, UK

    SpeedGuide.net Speed Test Results
    2392 kbps down (~2.39 Mbps, 292 KB/s)↓
    188 kbps up (~0.19 Mbps, 23 KB/s)↑
    2048 KB downloaded in 7.015 seconds
    1024 KB uploaded in 44.681 seconds
    Tested on: 2008.08.10 03:13 EDT
    Tested from: celticsurf.net
    Test Link: http://www.speedguide.net/speedtest/...t=C46NNLPFBHCP
    Provider: hari.blueyonder.co.uk
    Location: London, UK

  4. #4
    Elite Member trogers's Avatar
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    Using your PC, do a tracert to www.yahoo.com and post.

    Then connect up your laptop and post its tracert.
    "Contentment is not the fulfillment of what you want, but is the realisation of how much you already have" - anon

  5. #5
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    Thanks for the help.

    The results of a trace route using both PCs are posted below. I did two on each, one to yahoo.com and another to google.co.uk.

    Desktop PC

    Tracing route to yahoo.com [68.180.206.184]
    over a maximum of 30 hops:

    1 1 ms <1 ms <1 ms 192.168.7.1
    2 * * * Request timed out.
    3 * * * Request timed out.
    4 * * * Request timed out.
    5 * * * Request timed out.
    6 * * * Request timed out.
    7 * * * Request timed out.
    8 * * * Request timed out.
    9 * * * Request timed out.
    10 185 ms 172 ms 177 ms w2.rc.vip.sp1.yahoo.com [68.180.206.184]

    Trace complete.

    Tracing route to google.co.uk [66.249.93.104]
    over a maximum of 30 hops:

    1 1 ms <1 ms <1 ms 192.168.7.1
    2 * * * Request timed out.
    3 * * * Request timed out.
    4 * * * Request timed out.
    5 * * * Request timed out.
    6 * * * Request timed out.
    7 * * * Request timed out.
    8 * * * Request timed out.
    9 * * * Request timed out.
    10 * * * Request timed out.
    11 35 ms 44 ms 30 ms ug-in-f104.google.com [66.249.93.104]

    Trace complete.

    Laptop PC

    Tracing route to yahoo.com [68.180.206.184]
    over a maximum of 30 hops:

    1 1 ms 2 ms 1 ms 192.168.7.1
    2 * * * Request timed out.
    3 * * * Request timed out.
    4 * * * Request timed out.
    5 * * * Request timed out.
    6 * * * Request timed out.
    7 * * * Request timed out.
    8 * * * Request timed out.
    9 * * * Request timed out.
    10 182 ms 209 ms 307 ms w2.rc.vip.sp1.yahoo.com [68.180.206.184]

    Trace complete.

    Tracing route to google.co.uk [72.14.221.104]
    over a maximum of 30 hops:

    1 2 ms 1 ms 1 ms 192.168.7.1
    2 * * * Request timed out.
    3 * * * Request timed out.
    4 * * * Request timed out.
    5 * * * Request timed out.
    6 * * * Request timed out.
    7 * * * Request timed out.
    8 * * * Request timed out.
    9 * * * Request timed out.
    10 * * * Request timed out.
    11 * * * Request timed out.
    12 29 ms 27 ms 30 ms fg-in-f104.google.com [72.14.221.104]

    Trace complete.

  6. #6
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    I think that the first results after your first tweaking suggestions may have been a glitch. I've just re-used the TCP/IP Optimizer using the parameters from your first reply and have got much much better results.

    Indeed the speed of the Desktop is now comparable to the speed of the Laptop and the upload speed seems OK too so I think that your first suggestions have worked. Thank you.

    Of course if you have any further advice after having seen these results or if you found anything wrong with the tracert results or if you can confirm that everything looks OK now then I'd sure like to hear about it. I'm pretty ignorant about this whole field. Many thanks.

    (1) Original Settings on Desktop
    SpeedGuide.net TCP Analyzer Results
    Tested on: 08.10.2008 06:00
    IP address: 82.34.xxx.xx
    TCP options string: 020405b40103030201010402
    MSS: 1460
    MTU: 1500
    TCP Window: 256960 (multiple of MSS)
    RWIN Scaling: 2
    Unscaled RWIN : 64240
    Reccomended RWINs: 64240, 128480, 256960, 513920
    BDP limit (200ms): 10278kbps (1285KBytes/s)
    BDP limit (500ms): 4111kbps (514KBytes/s)
    MTU Discovery: ON
    TTL: 50
    Timestamps: OFF
    SACKs: ON
    IP ToS: 00000000 (0)

    (2) Desktop PC Speed with Original Settings
    SpeedGuide.net Speed Test Results
    2128 kbps down (~2.13 Mbps, 260 KB/s)↓
    334 kbps up (~0.33 Mbps, 41 KB/s)↑
    2048 KB downloaded in 7.884 seconds
    500 KB uploaded in 12.247 seconds
    Tested on: 2008.08.10 06:02 EDT
    Tested from: celticsurf.net
    Test Link: http://www.speedguide.net/speedtest/...t=7URCCIJ6Z1IC
    Provider: hari.blueyonder.co.uk
    Location: London, UK

    (3) New Settings on Desktop PC
    SpeedGuide.net TCP Analyzer Results
    Tested on: 08.10.2008 06:12
    IP address: 82.34.xxx.xx
    TCP options string: 020405b401010402
    MSS: 1460
    MTU: 1500
    TCP Window: 64240 (multiple of MSS)
    RWIN Scaling: 0
    Unscaled RWIN : 64240
    Reccomended RWINs: 64240, 128480, 256960, 513920
    BDP limit (200ms): 2570kbps (321KBytes/s)
    BDP limit (500ms): 1028kbps (128KBytes/s)
    MTU Discovery: ON
    TTL: 50
    Timestamps: OFF
    SACKs: ON
    IP ToS: 00000000 (0)

    (4) Desktop PC Speed with New Settings
    SpeedGuide.net Speed Test Results
    3257 kbps down (~3.26 Mbps, 398 KB/s)↓
    347 kbps up (~0.35 Mbps, 42 KB/s)↑
    3072 KB downloaded in 7.727 seconds
    1024 KB uploaded in 24.178 seconds
    Tested on: 2008.08.10 06:14 EDT
    Tested from: celticsurf.net
    Test Link: http://www.speedguide.net/speedtest/...t=L60IPZ5UFKU3
    Provider: hari.blueyonder.co.uk
    Location: London, UK

    (5) Laptop PC Speed
    SpeedGuide.net Speed Test Results
    3429 kbps down (~3.43 Mbps, 419 KB/s)↓
    316 kbps up (~0.32 Mbps, 39 KB/s)↑
    3072 KB downloaded in 7.34 seconds
    1024 KB uploaded in 26.545 seconds
    Tested on: 2008.08.10 06:16 EDT
    Tested from: celticsurf.net
    Test Link: http://www.speedguide.net/speedtest/...t=83GKJKY0BLME
    Provider: cable.mindspring.com
    Location: London, UK

  7. #7
    Elite Member trogers's Avatar
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    Power off the router and relocate it to an elevated position a few feet away from ALL other electrical devices, including away from any cordless phone and energy saving lamp.

    See if you can get all 3 ping times at the router in hop 1 to be <1ms.
    "Contentment is not the fulfillment of what you want, but is the realisation of how much you already have" - anon

  8. #8
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    Thanks. I have done what you instructed and have now got three <1ms ping times on jump one with several different sites.

    I now get an average (from 3 tests) of 3376 download and 351 upload on the desktop and both figures are close enough to the 90% tolerance of my advertised speed.

    Thanks so much.

    Is there anything else you think I should do?

  9. #9
    Elite Member trogers's Avatar
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    Try the following on your PC:

    General Settings tab:
    Custom settings - check
    Modify All Network Adapters - check
    network adapter selection - your NIC
    MTU - 1500
    TTL - 64
    TCP Receive Window - 128480
    MTU Discovery - Yes
    Black Hole Detect - No
    Selective Acks - Yes
    Max Duplicate ACKs - 2
    TCP 1323 Options:
    Windows Scaling - checked
    Timestamps - uncheck

    Advanced Settings tab:
    Max Connections per Server - 10
    Max Connections per 1.0 Server - 20
    LocalPriority - 1
    Host Priority - 1
    DNSPriority - 1
    NetbtPriority - 1
    Lan Browsing speedup - optimized
    QoS: NonBestEffortLimit - 0
    ToS: DisableUserTOSSetting - 0
    ToS: DefaultTOSValue - 80
    MaxNegativeCacheTtl - 0
    NetFailureCacheTime - 0
    NegativeSOACache Time - 0
    LAN Request Buffer Size - 32768
    Then select "Apply Changes" and reboot to take effect
    "Contentment is not the fulfillment of what you want, but is the realisation of how much you already have" - anon

  10. #10
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    Those new settings seem to be a retrograde step. The first three test results made after making the new settings and pasted below show an average of
    Download 1317
    Upload 294

    The next three results were made after reverting to the old settings from the backup file and they show
    Download 3521
    Upload 348

    So it seems that the new settings are a "straw" that "breaks the camel's back".

    I've left the reversion to the older settings in place. Is there anything else that you would suggest at this point or do you think this is the best it gets?
    Thanks very much for helping me. I really do appreciate you taking the trouble to do so.

    SpeedGuide.net Speed Test Results
    1281 kbps down (~1.28 Mbps, 156 KB/s)↓
    308 kbps up (~0.31 Mbps, 38 KB/s)↑
    2048 KB downloaded in 13.098 seconds
    500 KB uploaded in 13.32 seconds
    Tested on: 2008.08.11 03:08 EDT
    Tested from: celticsurf.net
    Test Link: http://www.speedguide.net/speedtest/...t=N7JR1ZN8OWHT
    Provider: hari.blueyonder.co.uk
    Location: London, UK

    SpeedGuide.net Speed Test Results
    1254 kbps down (~1.25 Mbps, 153 KB/s)↓
    333 kbps up (~0.33 Mbps, 41 KB/s)↑
    2048 KB downloaded in 13.384 seconds
    500 KB uploaded in 12.301 seconds
    Tested on: 2008.08.11 03:11 EDT
    Tested from: celticsurf.net
    Test Link: http://www.speedguide.net/speedtest/...t=14D6KYT20CVP
    Provider: pools.arcor-ip.net
    Location: London, UK

    SpeedGuide.net Speed Test Results
    1417 kbps down (~1.42 Mbps, 173 KB/s)↓
    241 kbps up (~0.24 Mbps, 29 KB/s)↑
    2048 KB downloaded in 11.839 seconds
    500 KB uploaded in 17.003 seconds
    Tested on: 2008.08.11 03:12 EDT
    Tested from: celticsurf.net
    Test Link: http://www.speedguide.net/speedtest/...t=PWJJNLHEDDRE
    Provider: hari.blueyonder.co.uk

    SpeedGuide.net Speed Test Results
    3448 kbps down (~3.45 Mbps, 421 KB/s)↓
    348 kbps up (~0.35 Mbps, 42 KB/s)↑
    3072 KB downloaded in 7.298 seconds
    1024 KB uploaded in 24.095 seconds
    Tested on: 2008.08.11 03:24 EDT
    Tested from: celticsurf.net
    Test Link: http://www.speedguide.net/speedtest/...t=ITFN841PQ4DI
    Provider: dynamic.dsl.as9105.com
    Location: London, UK

    SpeedGuide.net Speed Test Results
    3577 kbps down (~3.58 Mbps, 437 KB/s)↓
    349 kbps up (~0.35 Mbps, 43 KB/s)↑
    3072 KB downloaded in 7.035 seconds
    1024 KB uploaded in 24.031 seconds
    Tested on: 2008.08.11 03:26 EDT
    Tested from: celticsurf.net
    Test Link: http://www.speedguide.net/speedtest/...t=QA3GNHOKD100
    Provider: hari.blueyonder.co.uk
    Location: London, UK

    SpeedGuide.net Speed Test Results
    3539 kbps down (~3.54 Mbps, 432 KB/s)↓
    348 kbps up (~0.35 Mbps, 42 KB/s)↑
    3072 KB downloaded in 7.111 seconds
    1024 KB uploaded in 24.101 seconds
    Tested on: 2008.08.11 03:29 EDT
    Tested from: celticsurf.net
    Test Link: http://www.speedguide.net/speedtest/...t=MACUZ2MAJHYN
    Provider: hari.blueyonder.co.uk
    Location: London, UK

  11. #11
    Elite Member trogers's Avatar
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    Test speed at only UK test servers of this site: www.speedtest.net

    Test speed with TCP Window set to 64240 and 128480 and compare.

    Testing speed at overseas sites will be influenced by traffic conditions along the international lines, and thus vary quite a bit.
    "Contentment is not the fulfillment of what you want, but is the realisation of how much you already have" - anon

  12. #12
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    Hi,
    celticsurf.net is in Southport, UK and is on the SpeedGuide list. The only other server on the list that is closer is in my own location, London, but seems to be out of action.
    The results of the two figures that you give for TCP window setting were posted in my last message. Is this OK or do you suggest that I try another server with these figures.
    Thanks.

  13. #13
    Elite Member trogers's Avatar
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    Quote Originally Posted by thepcguy View Post
    Hi,
    celticsurf.net is in Southport, UK and is on the SpeedGuide list. The only other server on the list that is closer is in my own location, London, but seems to be out of action.
    The results of the two figures that you give for TCP window setting were posted in my last message. Is this OK or do you suggest that I try another server with these figures.
    Thanks.
    I am wondering why speeds fell to less than half with TCP Window set to 128480.

    Try testing at this NDT and when testing is completed, click the 'Statistics' button and post the pop-up report:

    http://nitro.ucsc.edu/
    "Contentment is not the fulfillment of what you want, but is the realisation of how much you already have" - anon

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