Like I said though, you may want to try whatever workarounds there are to install Mojave on your machine. With Apple supposedly focusing on cleaning up the bugs it might run better on your machine than High Sierra does.
I might, but I also may just leave it, as HS seems to work fine. The only performance upgrade I have left on the MBP is going from 8GB to 16GB of RAM, but I decided a while back it wasn't worth it. The biggest reason that I had to retire the MBP as my daily driver is it's limited I/O. My entire storage system of external drives was chained off of a single USB 2.0 port, along with keyboard, mouse, my USB DAC, headset, and whatever else I plugged into it. That just wasn't cutting it. I love having it as a truly portable system that isn't "docked" most of the time.
I also have an almost brand new Coffee Lake Windows 10 desktop that I built for longevity, so the MBP is a travel/portable machine that doesn't do a whole lot intensive, but I still like having a full OS, filesystem, and UNIX terminal available, unlike a Chromebook. So far so good on my desktop, which I built to last 10 years. I've run into a bit of a snag with RAM, my 16GB isn't enough with PS Elements, LR, and usual desktop stuff running at the same time, so I'm going to put another 32GB in there for a total of 48GB, which should get me to it's potential retirement date at EOY 2027.
Sad to say, but I think my next laptop will also be a Wintel machine, as I want to have a very light machine to travel with, probably a Lenovo X1 Carbon, but we'll see. I'll probably buy a new to me Mac when the 2011 MBP dies, just to have a UNIX machine to play with, but I might buy a refurb 2015 at that point.