HTML5 biggest problem is that sometimes the FPS is low and sometimes its high (60) , and I'm still on same computer , then why it varies? Is it a common HTML5 problem or it's just me
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it's just your bad game dev skills. you probably have used some stuff where it shouldn't be used, or made some fillrate performing changes on screen which is pretty heavy on cpu and stuff.
anyhow i think it's just you. i've never had such a problem