iMac slow

Hey,

Can any FCPX user help me, please? Apple support is useless. I'll keep this brief...

^^^ Here's my Mac. Latest FCPX too. However, for the last couple of years I've repeatedly run into the issue of FCPX grinding to a halt - scroll wheel every time I do anything in the timeline. This usually happens a couple of months after completely rebooting the system - fresh install of FCPX etc. I'm bored of doing this now.

I have the master FCPX file in my internal hard drive, including all the render files etc.

Is there something I'm doing wrong? Should I be managing the files in a particular way to stop this from happening? Last time I called Apple they suggested it was a plug-in issue, which is nonsense.

Help! Thanks in advance, lovely people...