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[Please Help] Slow down when adding google analytics & optimise

hello,
it’s getting slow down when I added google analytics & optimise ID,
below scores are the same situation only changing the analytics&optimise on/off.

with google analytics & optimise ID - super slow

without with google analytics & optimise ID - no problem

with google analytics & optimise ID, keep showing white screen about 4 seconds, but without the ID, there are no problem.
Any help would be appreciated.

Where are you adding it?