in many cases often its faster just to switch from debug to release - compilers are good to vectorise many loops. Worth to give it a try before rewriting clean loop/code into SIMD/NEON.

Stop using electron

Never. You will have to pry it from my cold, dead hands.

In most cases you should skip SIMD also for new code. Often a non-SIMD version is required for compatibility, just stick with that.