Delayed mouse events / lag since parallels-15

PD15 use virtual usb mouse as input device for all Linux guests by default. PD14 use virtual ps/2 mouse.
If you use custom kernel inside guest OS and has enabled some additional usb/hid (or other) logging it could lead in usb mouse events processing.

ps:
Also you can try to disable usb mouse by adding devices.usb.mouse=0 into VM Configuration->Hardware->Boot Order->Advanced Settings->Boot flags.
But this could lead in cursor disappearance problems on login (greeter) screen.
 
thanks a lot, device.usb.mouse=0 does actually resolve the issue for me.

further observations:
* with usb mouse disabled, i can still see the pointer in gdm / greeter just fine
* with usb mouse enabled, the delay / lag does not occur within gdm / greeter (eg. mouse over response time is perfectly fine)
 
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