Ideal settings of memory limits

Hello WPMUDEV team,
maybe I have a silly question, but I have read a tons of discussions, pages and tutorials and I am still confused. My question is -What are ideal limits for wordpress multisite? and Do memory limits have an impact on WP speed?

Currently I have a VPS 1 proc. Xeon 1.70 GHz with 4GB ram and data stored on SSD
also I have currently set php memory limit to 1gb and WP memory limit to 256M.

I use geolocations, woocommerce and another circa 25 plugins (I know it is a lot, but I need them) and users will be able to write their own posts...

Is my memory limit setting right set? Or may I something change?

Thank you for your reply and sorry if my question is dumb...
S.