macbook pro mid 2012 i7 2.9

It's not Logic, it's macOS to blame for this. If you're running the latest OS (i.e. Mojave), expect this kind of CPU overloads. The OS is designed for optimal performance with most recent Macs which have much faster CPUs compared to your 2012 MBP. I'd recommend using macOS Sierra (10.12.6), if you'd like to run the latest version of Logic (10.4.2). If you install an earlier version of macOS / OSX and an earlier version of Logic (say, 10.3.x) it would work even better.

Are you fairly new to Logic? You do have to learn how to use it... every plugin and every virtual instrument uses CPU power. Logic, if used incorrectly can bring the most powerful computer to the point of crashing. In other words... you can't do whatever it is you want, the program has to be used with the knowledge of the limitations imposed by the hardware.

So yes, two cores is a limitation... Mojave will not help matters any. Both Logic and Mojave stress the graphics hardware.

Quite a few MacBook Pro's had dual graphics, a software based graphics that used system memory gave long battery life, the hardware graphics was used when the system needed it. It's recommended you use the hardware only, It's in System Preferences/Display (I think) if it's not there then your MBP doesn't have the two graphics processors.

First thing you can do is adjust Logic's preferences. Go into Logic's Preferences/Audio set the "I/O Buffer to 256", set Multithreading to "Playback Tracks".

I realize it wasn't for me, but there's always a way to express yourself (and your frustration with technology) without being obnoxious. Cheers!

As for your issues with Logic, as I mentioned before, it's hard to tell why Logic is crashing without knowing what other software is installed on your laptop. You could try running a diagnostic tool called Etrecheck and then post the resulting log here and /or in a discussion dedicated to macOS Mojave for analysis. Etrecheck will scan for both software and hardware issues.

It's hard to tell why, without knowing what other software you have installed. It might as well be some hardware issue too, given that your laptop is pretty ancient by computing standards.

Blah Blah Blah.

This doesn't help me!

Thanks

Not the best attitude, pietro975. Having a bad day? Not an excuse for being rude to someone who's trying to help.