Sketchup 2021 takes forever to open legacy files

Technical Problems SketchUp
8

Quick study:

  1. I just opened the original file (130MB) with
    SU2017Make: ~ 10 sec
    SU2020: ~ 10 sec asked if I want to fix problem then after other ~25 sec is opened
    SU2021: ~ 30 sec (I guess this one fixed it without question)

  2. I saved the fixed file with SU2020 as 2017 format. Then opened:
    SU2017Make: ~ 9 sec
    SU2020: ~ 13 sec
    SU2021: ~ 13 sec

  3. I purged then I saved the file with SU2020 as 2017 format. (20MB) Then opened:
    SU2017Make: ~ 5sec
    SU2020: ~ 5 sec
    SU2021: ~ 5 sec

  4. I saved the purged file in SU2021 and ended up with 10,6MB and opening time ~ 3 sec.

Lesson learned: :innocent:
a) There was an error in the original file what SU2017 did not recognize, therefore opened it without fixing .

b) A later version of SU has already been prepared to detect this kind of error, so the time spent correcting the error increased the opening time.

c) The SU2021 format is really using less space! :+1:t4: