[pack3tz]

booting up other OS's in VMs take forever  on my current system build.

If I may ask, what VM are you using and what's the specs on the Host (physical) system on which the VM Is running on?

I'm using VMware Fusion and i use kali , ubuntu, centOS on it and they all seem to lag

The specs of the laptop i use it are:
2.9 GHz Intel Core i7
16 GB 1600 MHz DDR3
APPLE HDD ST750LM022 750 gb ( i will be upgrading to an SSD soon)
Intel HD Graphics 4000 1536 MB
on macOS Sierra

Not just that, but how else are your vm's configured? allocated or dynamic hdd? what video memory are you dedicating to them? what else is running? etc etc etc