guest audio choppy, video lags and windows screen flickers

[L.]

Host: Win7 64bit, intel i7-930 processor, VirtualBox-5.0.6-103037-Win Guest: Win8.1 64Bit with VirtualBox_Extension_Pack-5.0.6-103037

Would also like to refer to:

issue #14633, that describes also the audio problem, but may have a different cause.

issue #4088, latency fixes (Windows hosts only; bug ), fixed in the release

To reproduce this: enable 2d/3d video acceleration for the guest, using an usb mouse

Steps to reproduce:

-start the guest
-logon, during logon process the screen flickers
-lauch IE, again sometimes the screen flickers during startup of IE
-goto to youtube and start a music video.

-if you don't use the mouse, the sound and video are almost perfect

-hover the mouse above the playing video area
-rapidly move the mouse from left to right/up/down within the video rectangle a) the sound will become "choppy", b) the video seems also to lag a little

In the previous version (5.0.4) audio was constantly choppy (even without moving the mouse), as if you put the volume control to high, like to much voltage on a speaker.

In the previous version (5.0.4) the video was constantly lagging, showing blocks, seems to stop some milleseconds

After installing 5.0.6, the sound and video performs better but it's not solved.

If I disable 2d/3d video acceleration, audio is back to normal, no video lags and no screen flikkering. (don't see a benefit for enabling video acceleration)

Enabling video acceleration and using the usb mouse together seems to cause the problem.

May be both have an issue.

Attached logs and the description might lead to a solution?

[amcneish]

Disabling 2d/3d video acceleration for the guest makes the sound much better... But it still has some problems with complex classical music...

Audio still needs work in 5.0.6 (but it is getting there)