This is mainly a response of that commentary, which is also question answer.
I'm pretty impressed that you were able to run Citra with that type of processor (AMD A6 PRO-7400B R5), as it's recommanded to have a CPU with high single core performance, as said on Citra forum.
Also, there is a CPU rank page about their single core performance, and it's recommended to have at least a score of 1800 on that rank (your CPU has a score of 1381, which is pretty low).
To have test it with 2 computers, the lonely answer that can solve your problem is to change the hardware. As Citra doesn’t really work well with multi-threading, it won't gibe you a good result if your CPU doesn’t have enough performance.
I tested and played at Citra with these 2 specs:
- Intel Core i5-4210U with AMD Readon R7 M260 (processor single core performance rated at 1385, I was barely able to see the starting screen on Pokemon Sapphire Alpha)
- Intel Core i5-8300H with Nvidia GeForce GTX 1050Ti (processor single core performance rated at 2360, I don't have any issue currently beside little freezing from time to time).
Also, you pointed the RAM limit, from my experience, Citra don't really need some RAM space as I can run other heavy RAM user software (like multiple tabs Chrome), the main limit is the CPU (GPU need to be check a little also, but some low cost graphic cards are able to run Citra games).
I'm really bored that the answer of your question needs you to buy something, but I'd personnaly waited to buy another computer to play at Citra.