I am getting around 200 - 300 Mbps on Speedtest.net on my new Gigabit cable modem connection.

I am wondering if this is due to the service or my Windows TCPIP settings.

Here is some info to get the ball rolling.

SpeedGuide.net TCP Analyzer Results
Tested on: 2019.02.18 19:55
IP address: 173.176.xxx.xx
Client OS/browser: Windows 10 (Chrome 72.0.3626.109)

TCP options string: 020405b40103030801010402
MSS: 1460
MTU: 1500
TCP Window: 262656 (not multiple of MSS)
RWIN Scaling: 8 bits (2^8=256)
Unscaled RWIN : 1026
Recommended RWINs: 64240, 128480, 256960, 513920, 1027840
BDP limit (200ms): 10506kbps (1313KBytes/s)
BDP limit (500ms): 4202kbps (525KBytes/s)
MTU Discovery: ON
TTL: 52
Timestamps: OFF
IP ToS: 00000000 (0)

I used TCP Optimizer to 'optimal' and used 'experimental' tuning.

Any tips to troubleshoot this so I can see if it's my laptop or the service which is the isse?