Finally upgraded to Sequoia on Mid-2015 MacBook Pro - how much lag is normal?

I have a MacBook Pro (Retina, 15-inch, Mid 2015) and after clinging to High Sierra for years because of the Dashboard feature (RIP my sticky notes ;_;) I was finally having too many problems with Firefox ESR, so I figured it was time to bite the bullet and upgrade.

Everything went alright—I think—but I notice my computer is working pretty hard to keep up. It's quite hot, the fans are constantly running strong, and there is intermittent lag when opening new windows/applications, navigating menus, etc. Sometimes it's smooth, but more often than not, it'll reach varying degrees of sluggishness for no apparent reason when all other factors are the same.

When things get really tough is when I'm trying to use a heavy program like Photoshop, or sites like YouTube or Google Docs/Slides/etc. I previously assumed the web issues in particular were due to my outdated browser, but Firefox is all up to date now, so it shouldn't be that.

Is there something additional I can do to make things smoother and not so hard on my laptop, or is that just the normal baseline for a machine this old? I only ask because I've seen people saying they're also running Sequoia on the same model and not experiencing any lag or overheating, so I can't help but wonder if I did something wrong or missed some extra steps I was supposed to take.

submitted by /u/panasonicfm14
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