TLDR, if you are facing slow speed after your plan is upgraded by TM, these are the things to check.

Note: This only apply to slow speed when tested with a LAN cable. Wi-Fi will be story for another day.

1. Check your TM Fibre modem, some old fiber modem only support up to 100Mbps. Make sure you restart your modem and router after the plan upgrade is done.

2. Change your Ethernet cable from modem to router and router to your PC
Ethernet cables will eventually degrade due to oxidation. Just get a Vention / Ugreen CAT6 cable from whatever online shopping platform you prefer, they are super cheap and pretty decent.

3. Update your router to latest firmware, reset the router and setup again.
Unless your router is still AC1200, most if not all Wi-Fi 6 routers can support up to 900Mbps on stock configuration.

4. Last resort, give TM a call and request them to check in their system and send a technician.

How to test your connection to make sure TM is giving you the right speed?
1- Connect a LAN cable to the router
2- Use speedtest.net desktop app for maximum accuracy
3- Disable whatever antivirus or bloat you have while testing

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