I am using Deepin 15.5 on my desktop and when I use the 'Multitasking View', I see that UI is lagging and the animations are not smooth. To reproduce it I just click on the Multitasking button and then click on window and immediately see a drop in fram rate. This doesn't happen with other animations like swtiching to the desktop to the right or left or displaying all windows in the current desktop. I also have KDE on my system and when using the virtual desktops and use the analogous of 'Multitasking View' the animations are very smooth.