first of all, let me tell you I'm a total novice in 3d modelling, my experience is with Sketchup only. Recently, I came in need of a particular model, and I got it in a STL format. Sketchup imported it just fine, however, the mesh is so loaded with unnecessary details, it makes the application just freeze. I was told Blender can solve this problem, so I came here to ask you how can I make it a clean mesh, without losing detail but making it lighter so the software can run (and no, it's not a hardware problem, I'm using a GTX 1070 with 16gb ram and up to date processor) This is what I'm talking about: https://imgur.com/a/RC3U9Er Sketchup can't handle that many faces. So, how do I fix it using Blender?