Question Short freezes in Rainbow Six 3: Raven Shield

[SomeDesperateGuy]

In the planning phase of the singleplayer of Rainbow Six 3 I get short freezes whenever I place down a waypoint and it's driving me insane.
The freezes are completly fixed in Safe Mode.

My specs:

• Windows 10
• i5 7600k
• GTX 1060 6 Gb
• Asus Z170 Pro
• 16 Gb DDR4 RAM
• 250 Gb SSD for Windows
• 1 Tb HDD for all the other stuff
• Corsair TX550M (550 Watts, 2 years old)

What I tried already:

• All sorts of reinstalls (Game, Drivers, even Windows)
• Force usage of DirectX 9
• Disabling everything there is to disable in the NVIDIA driver settings (AA, VSYNC, etc.)
• Pretty much every Compatiblity setting
• Disabling XBOX Game Bar, DVR, etc.
• dgVoodoo2 (although I'm not sure if I tried everything there)
• Everything suggested on PcGamingWiki

Maybe helpful:

• The stuttering/freezing appears consistent (every time I click on the planning screen)
• During the freezes the GPU 3d usage spikes to exactly 70% but never higher

Thanks in advance for any help!

[Edit 1: Added PSU to the spec list]

 

[Ralston18]

Your system's PSU: make, model, wattage, age, condition?

 

[SomeDesperateGuy]

Sorry should have included it from the start:

• Corsair TX550M
• 550 Watts
• 2 years old
• regularly cleaned and no issues I'm aware of