Frappe v11 and v12 takes all my laptop resource

i have laptop with ram 4 and cpu core i3
life was great before version 11 and 12
after that i can’t develop with my laptop …
when i try to do bench serve in v11 or v12 i get error
Redis cache server not running. Please contact Administrator / Tech support
in Django flask express … life is good yet v11 and v12 needs more computational power to work with … is this a result of making frappe x4 faster thread ? if so can i disable this option when i want to only use bench with it’s minimal power ?