[User 224999]

1. Pvr list view:
The PVR window is very sluggish when a video is playing and you enter the PVR window.
The video is shown in the preview box, but the entire window becomes very slow.
This did not happen on jarvis.
If you exit the window back to home screen everything runs fast again, even with background video enabled. Epg timeline seems to be ok.. Just pvr window. I've tested the estuary skin and that seems to run fine...

2.color picker:
when selecting colors, the color picker window seems to take a lot longer to load the color grid, sometimes up to 50 seconds. This has a always been a little bit slow in the RPI, but it's become incredibly slow since Krypton. This may very well be a kodi/libreelec thing, but there may need to be something changed in the skin helper script to speed this up for Krypton.

3. Spotify:
I've mentioned this in the Spotify addon forum, but I'll mention it anyways.
The Spotify addon is now taking a long time to load/start playing music

1 +2 --> This very much sounds like Kodi bugs to me or some error in the code that only pops up now in Krypton and wasn't noticed in earlier releases. The Krypton version is exactly the same code as the Jarvis version of the skin with the exception for some changes that had to be done to make it compatible for Krypton. In fact, I'm still coding the skin for Isengard and merge it up to Jarvis and Krypton. Offcourse I'll stop with Isengard as soon as Krypton gets released.

None of the changes should result in the behaviour you're talking about here. What about CPU usage ? Is it maybe piking a lot in Krypton somehow ? BTW: It;'s generally a bad idea on the pi to enable the live video as background or as thumb in the channel list. The pi isn't particular good at rendering the UI together with the video on screen too.

3 --> There's been a change in Krypton that changed the default player. It broke the Spotify addon. Already reported it to the devs.