On a dual-core i7, 8MB RAM, switchable graphics with Intel HD 520 and AMD R7 360, a clean install of KSP 1.1 stutters, where 1.05 is easily playable. On both 32- and 64-bit builds of KSP 1.1,
+ Loading Systems takes 230 seconds (50s with 1.05)
+ Main Menu stutters about 1/2 second just before the sprites come into view
+ Transition screens, black with 'Loading..' in the corner, take 20 seconds (5s with 1.05)
+ In the scenario "EVA over Kerbin" panning to show the planet stutters for about 5 seconds; panning in camera-view in often stutters about 1 second
+ Transition from map-view to camera-view takes 1-10 seconds (less than 1s with 1.05)
+ Esc menu -> Settings -> Accept, with no changes to any settings, pauses for 30 seconds before the Esc menu is responsive
+ Main Menu -> Quit takes 20 seconds before the KSP window closes
This felt like garbage-collection, or file-system timeouts. Things I tried with no noticeable help:
reducing graphics quality to minimum, setting the graphics to use AMD only, ensuring the same file-permissions on 1.05 and 1.10 install directories, turning off the send-progress-to-Squad option, pausing Windows Defender, setting the KSP option to use LEGACY_SHADER_TERRAIN, ...
Any suggestions? Logs and DxDiag are here.