Thanks guys for such positive responses, it really keeps me going
Michael: I believe it was you who asked this very question on FB. Let me paste my answer here for people who do not follow my work there:
Yup, the performance is much better since I got rid of excessive faces here and there and replaced certain objects with the ones I've made. For example, the old AC cover with vents had 12.000 triangles, mine has only 1.000. The old wheels (all four combined) had 30.000 triangles, the ones made by me have only 9.000. So you see, I managed to save 32.000 triangles on those two things only

That's a lot, especially given the fact that the default SD202 has somewhere near 70.000 triangles