What is the least RAM intensive version of Google Services?

I have an S3 on android 12 which is laggy with Google services and if I try to get 13 on it with google services, it keeps rebooting. I need this phone for my college work as well as receiving emails and such. I also want to use it in my free time for things like YouTube. For android 13 and maybe even 14, which version of google services takes up the least RAM. Is MicroG good? I'm currently running bitgapps. The average RAM usage is about 90%