You use what to speedtest? LAN? WIFI? The most accurate I think is by using your smartphone (decent ones) to test. Some LAN cable are limited to 100Mbps especially if you went through an old switch. Some laptop or mini pc wifi card is 1x1 which makes even 100Mbps is a struggle. For example, I bought a cheapo mini pc powered by Intel N100. The realtek wifi card is a pain in the ass... giving between 50-60Mbps. I tried a usb wifi dongle which I get for free and easily 150Mbps. With my Realme GT Neo 3, I get almost 500Mbps.

You are connecting through mesh when doing speedtest? Not all mesh are created equal.

Well, havent you heard of the rumors from those years when they claimed Maxis speed > Hotlink? Its just like how some reported that they cant use the internet when inserting the broadband sim into their phone or inserting the smartphone plan sim into the router. I see no surprise here.

What is more interesting is what you get from which plan. Why dont you share your findings?

Speedtest local telco server is uncapped.
test with telco own speedtest

4G+ and 5G should get pass 100mbps speed
new modem ?
report to seller.

Interesting... I was thinking the other way around. I thought smartphone plan would be throttle on the router instead. Location?

Im getting 500Mbps these day, up from 300Mbps on the lousy ZTE router that I modded with 2 fans and still hang regardless. Im so satisfied with the X50 5G that I bought another one for my office.

BTW, what is the firmware you are running on the X50 5G?