I just got my MBP 2018 15 inch base spec model with 512 gb SSD upgrade. The day I got it I upgraded the OS to Mojave. since then, I kinda feel my MBP got slower.. (even my Garage Band kind of lag when I'm trying to open some charts) I'm not sure if this is normal or is because of Mojave.. When I make music with Garage band, even though I didn't use any crazy heavy instruments ( I only used a few stock instruments just to play around with it, with some few drum wavs ) It produce some heat.. is this normal ? if this machine can't even take a little work without getting all heated, how am I supposed to work on some more heavy project ?