Massive performance/usability drop: logs, profile & screencast

[Anonymous]

Fusion has become increasingly unworkable for me over the last couple of updates; there's an upto 5s delay when I use the right mouse button to orbit; basic operations like trim, on a new sketch are slower than they used to be when you had 30 sketches and 100 bodies; everything is just unresponsive and horribly slow. Measures taken listed at the end.

i7-7700k @ 4.2, 3GB ram, 1.5tb nvme drive,
nVidia RTX 2080 w/ latest drivers,
Windows 10 IP 20175 200717-1349 (slow),
and Windows 1909 on same machine (dual boot).

demo: https://www.screencast.com/t/hBNJznkXr1
vs 2019 cpu profile: https://www.kfs.org/oliver/misc/Report20200928-1126.diagsession

fusion diagnostic dump:  https://www.kfs.org/oliver/misc/Fusion360DiagnosticLogs.zip

- New design,
- Create sketch on x plane,
- Sketch opens,
-> 6s before the ribbon updates to show the sketch ribbon;

- New deisgn,
- Create sketch on x plane,
- Place two overlapping rectangles (for a + shape),
- Mouse-over edge
-> upto 8s for highlight to appear,

- New design,
- Create sketch on x plane,
- Place two overlapping enclosed shapes (e.g rectangle + elipse),
- Attempt to trim an edge,
-> Between 1-6s for the trim operation to execute,

- New design,
- Create sketch on x plane,
- Place a single line,
- Complete sketch,
- Hold right mouse button and attempt to orbit,
-> 2-5s gaps in rendering, while rotating,

----------- steps taken -----------

1. booted a release version of the OS (1909),

2. cleared cache,

3. changed the performance setting from graphics diganostics,

4. checked for GPU driver update (already installed),

5. shutdown other apps,

6. ran os troubleshooters,

7. cleaned tmp directories/folders, restarted,