Slow browsing while shifting viersion 3.3 to 5.2

Hellosss

I was using 3.3 Mikrotik from last 2 years. and setup as Hotspot. every thing was working Fine. and perfect.
now i switch to 5.2 mikrotik. and import and export the File to save the configuration.

all user authenticat perfctly. but i m getting slow browsing isue.
when i user try to open website. then chrome start searching and after a delay its display the page.

can i know why its so?

???

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