Clouds aren't more efficient, it's just a way of avoiding the limitations of a single computer by sharing the load over a network. It only works because connection speeds have gotten fast enough to send and receive information in a shorter time than the computer could just do all of the work itself. This is only possible in the last decade.

Obviously, projects on a very large scale such as compiling databases into statistical data would benefit from this a lot more than simple calculations, renders, or simulations, but generally it still hinges on how fast the connection speed is.

Didn't expect him to make a second brain for himself. That means he'll be able to do even crazier things using skills like "parallel thought" and the like. He may even be able to use twice as many spells at once.

Magic was not enough so now he became a server.

MC:Lets make Brain Network ( Bot-ting )
Ahkasha: The system is watching you.

What if the god that is the akashka system is actually the dragon god he died challenging in his previous life? Just a shower thought...

i guess the final boss will be the system

Actualy if we think that the human brain is a computer with a memory for example of 1 gigabites and a procesor intel i7 the cloud only work for extra storage of memory for more speed of procesing you need a better procesor withe 2 nucleos for the stress of work is equaly share

i thought he was going to do the immortal dnd wizard thing but if he could do that he would have done it in his previous life

This is too big brain for me to understand.