How to run Citra faster on low end pc?

Issue:
So, my pc can run citra at a playable speed, Native. but native is laggy sometimes and i need help.Here are my system specs:
Processor: Intel Core i5-2320 CPU @ 3.00GHz 3.00GHz
System type:64-bit based processor
RAM:4.00GB (All of it usable)
any fixes for my specs?

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