Is it possible to share the processor power of two Mac?

I am about to buy a refurbished 21" iMac which, while having a good GPU (AMD radeon pro 555x), doesn't have a good processor (3.6 GHz quad-core Intel Core i3)

My questions are the following:

Can I use the thunderbolt port on the iMac and on my actual Macbook air to combine the AMD GPU of the iMac and the 1.1 GHz Quad-Core Intel Core i5 CPU of my laptop to create a kind of god-computer?

Is the CPU of the iMac really that bad? (it has a good speed or whatever is called this number: 3.6 and a fair amount of cores but is only an I3, dose the i value really matter?

I am trying to play Minecraft whit a good farmerate and speak French so don't mind the written mistakes please.