My internet speed seems to be capped and I cannot figure out why after running through many sources of help on the internet.
I used TCPOptimizer, it seems to improved a little. When I run the program again, the "Current" settings I have does not seem to reflect the "Optimize" option that was executed without error. Did I miss out on anything?

1. What is your advertised internet speed ? 1Gbps
2. What actual transfer speed do you get? 200-270 Mbps
3. Who is your Internet Provider (ISP), and what type of connection do you have ? I'm based in Singaore, ISP - Starhub, using Fibre Broadband
4. What are your current settings ? See below.
5. Your modem/router/ap brand ? D-Link DIR-868L
6. Your Operating System ? Windows 10, 64-bit

TCP Analyzer Result
SpeedGuide.net TCP Analyzer Results
Tested on: 2021.07.16 01:27
IP address: 116.89.xx.xxx
Client OS/browser: Windows 10 (Chrome 91.0.4472.124)

TCP options string: 020405b40103030801010402
MSS: 1460
MTU: 1500
TCP Window: 131328 (not multiple of MSS)
RWIN Scaling: 8 bits (2^8=256)
Unscaled RWIN : 513
Recommended RWINs: 64240, 128480, 256960, 513920, 1027840
BDP limit (200ms): 5253kbps (657KBytes/s)
BDP limit (500ms): 2101kbps (263KBytes/s)
MTU Discovery: ON
TTL: 48
Timestamps: OFF
IP ToS: 00000000 (0)