Hi im hoping for some help. Ive just installed the latest windows 10 anniversary update. Before the update i got around 50fps in zwift and i could minimise the app and run other programs simultaneously without any issues , i quite often ran bbc iplayer or similer in the corner while in zwifts windowed mode.
Now zwift still runs at 50fps but if i then go and open another program when i return to zwift the fps drops to around 10fps and doesnt recover. If i open the other program first then run zwift i get 50fps again. Its like my pc is prioritising which programs get all my pcs power. Has anyone got any idea how to solve this? I loked being able to multitask while using zwift and really want it back
Disable “Game DVR” in the Xbox app / Open Xbox app > go to config > Game DVR > Disable
or through regedit
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\PolicyManager\default\ApplicationManagement\AllowGameDVR
Set “value” to 0
restart
Found a youtube video for your convenience as well:
https://www.youtube.com/watch?v=bU2D_Q0tcBI
It’s a known problem with the anniversary update. Affects not just Zwift, but gaming in general.
tried both of these and unfortunatly its still doing it 
as soon a click play on the radio app or open browser the fps drop ingame and wont recover. if i start the radio app/browser first then zwift my fps are as they should be.
apprieciate the help this is going to drive me mad fast
wasted my entire evening trying to fix this now . ive disabled stuff/ updated all my drivers etc . bloody microsoft… is there an easy way to uninstall this aniversary update and revert to how my pc was earlier.
its going to drive me nuts if i cant multitask while zwifting . as long as i launch the radio first and dont want to switch station i will be able to play at the right fps with music. but ive got no hope of watching any programs/films/videos without the fps dropping to unplayable…as i have to open them on top
Ive rolled the update back and the issue is now gone 
microsoft suck
I have a similar issue - but I have Windows 10 Educational that I used to update a windows 7 installation -
When I start I get 60fps but after switching or starting some other apps (usually chrome to listen to Pandora - or VLC to watch some cycling videos) I get 7-13fps - This never happened in windows 7 - Even after closing the apps the frame rate stays low -
I am very reticent to rollback to Win7.
I have already disabled game DVR and made sure that I was in maximum performance mode (I Have a desktop with a GTX960 P5 and 2 monitors 1 1080 and the other 1920x1200
Any suggestions?
Thanks