Mac running slow
So I got my Mac back in December 2017, The thing was a beast! Had a couple of issues later in 2018 which resulted me in having to reinstall MacOS, by doing that it Had unmounted the SSD. Anyway Problem was solved until about Maybe later last year where it has been really, dreadfully slow at doing anything.
Upon opening any application every-time applications open 'Not responding' and I have to wait maybe 10 seconds until I can interact with that certain app. The Mac running slow is certainly getting on my nerves now it seems to beech-ball whenever I want to do anything and have to let it think for 10 seconds.
I have tried everything, cleaning files, removing apps. I read somewhere it could be your SSD Full, well I have used only 161GB out of 1TB and it's running slow? I also did a speed test on it and read and write were about 80-90mbs. Any Help would be greatly Appreciated, Mac info below I have not modified the system or hardware in anyway either.
iMac (21.5-inch, 2017)
2.3 GHz Dual-Core Intel Core i5
8 GB 2133 MHz DDR4
Intel Iris Plus Graphics 640 1536 MB
iMac Line (2012 and Later)