These 3 mths (May - Jul), TPG gives extra 50GB:
https://www.tpgmobile.sg/
That means:
* $10 50GB plan becomes $10 100GB plan (until Jul)
* $18 80GB plan becomes $18 130GB plan (until Jul)
So more mobile data usage on TPG is to be expected -- which may cause more load on the network at times.
When was the last time you get 100GB/30days -- for $10 ?? Haha..
People are going to use / abuse TPG mobile data -- even when not necessary -- like switch off WiFi & use mobile data even when at home etc.
Of course (sometimes) it could be your phone or the app / Web site that you're accessing has problems -- instead of TPG network slow.
Re-boot your phone, test different apps / access different Web sites (or switch to WiFi) -- to better determine if TPG network is experiencing temporary congestion.