This sounds at first as if some drivers are not installed in the optimal version or sth is missconfigured.
If you are an inexperienced Linux user, you will have a hard time avoiding independent google and building up a certain technical understanding. Part of this is to better isolate your problem than "... my system lags, Blender crashes, etc... [...] blender crashes all the time... My 2013 old Imac did better than this"
Start by familiarizing yourself with your graphics card driver.
When you narrowed down your problem and cant find a way to fix it ask at https://unix.stackexchange.com/
A general hint which is completely at the wrong place here but might help your actual goal: Arcolinux is based on Archlinux. This is advertised as "A simple basic system can be extended almost arbitrarily according to the needs of the respective user". Arch is a powerful tool especially if you want to create a minimalistic operating system for special requirements. There exists distributions where beginner friendliness is a bigger goal than custom experience.