Check how badly Multitasking View performs on Deepin 15.9 (also noticed on previous versions) when launched first time
https://mega.nz/#!OdU33SwB!Z994e ... _DblsBjybN4dDHfIwhU

And check how good the same thing performs on Elementary OS on the same hardware
https://mega.nz/#!mYN3hARQ!mVu84 ... MgO0M1kdf97JlVvZcMI

The hardware
System:    Host: deepin Kernel: 4.15.0-29deepin-generic x86_64 bits: 64 compiler: gcc v: 7.3.0 Desktop: Gnome
           Distro: Deepin 15
Machine:   Type: Desktop Mobo: ASUSTeK model: Z170-DELUXE v: Rev 1.xx serial:
           UEFI [Legacy]: American Megatrends v: 3504 date: 06/29/2017
CPU:       Topology: Quad Core model: Intel Core i7-6700K bits: 64 type: MT MCP arch: Skylake-S rev: 3
           L2 cache: 8192 KiB
           flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 64128
           Speed: 4118 MHz min/max: 800/4300 MHz Core speeds (MHz): 1: 4146 2: 4300 3: 4256 4: 4214 5: 4277
           6: 4254 7: 4297 8: 4296
Graphics:  Card-1: NVIDIA GP104 [GeForce GTX 1080] driver: nvidia v: 390.67 bus ID: 01:00.0
           Display: x11 server: X.Org 1.20.0 driver: nvidia unloaded: fbdev,modesetting,vesa
           resolution: 3840x2160~60Hz
           OpenGL: renderer: GeForce GTX 1080/PCIe/SSE2 v: 4.6.0 NVIDIA 390.67 direct render: Yes
Audio:     Card-1: Intel Sunrise Point-H HD Audio driver: snd_hda_intel v: kernel bus ID: 00:1f.3
           Card-2: NVIDIA GP104 High Definition Audio driver: snd_hda_intel v: kernel bus ID: 01:00.1
           Sound Server: ALSA v: k4.15.0-29deepin-generic
Network:   Card-1: Intel Ethernet Connection I219-V driver: e1000e v: 3.2.6-k port: N/A bus ID: 00:1f.6
           IF: enp0s31f6 state: up speed: 1000 Mbps duplex: full mac:
           Card-2: Broadcom Limited BCM4360 802.11ac Wireless Network Adapter driver: wl v: kernel
           bus ID: 07:00.0
           IF: wlp7s0 state: dormant mac:
           Card-3: Intel I211 Gigabit Network Connection driver: igb v: 5.4.0-k port: c000 bus ID: 0b:00.0
           IF: enp11s0 state: down mac:
Drives:    HDD Total Size: 2.34 TiB used: 80.90 GiB (3.4%)
           ID-1: /dev/sda vendor: Samsung model: SSD 850 PRO 256GB size: 238.47 GiB
           ID-2: /dev/sdb vendor: Samsung model: SSD 850 PRO 1TB size: 953.87 GiB
           ID-3: /dev/sdc vendor: Crucial model: CT1050MX300SSD1 size: 978.09 GiB
           ID-4: /dev/sdd vendor: Kingston model: SH100S3120G size: 111.79 GiB
           ID-5: /dev/sde vendor: Kingston model: SV300S37A120G size: 111.79 GiB
Partition: ID-1: / size: 109.53 GiB used: 80.90 GiB (73.9%) fs: ext4 dev: /dev/sdd1
Sensors:   System Temperatures: cpu: 36.0 C mobo: N/A gpu: nvidia temp: 55 C
           Fan Speeds (RPM): cpu: 0 gpu: nvidia fan: 34%
Info:      Processes: 227 Uptime: 8m Memory: 31.35 GiB used: 3.09 GiB (9.8%) Init: systemd runlevel: 5
           Compilers: gcc: 7.3.0 Shell: bash v: 4.4.19 inxi: 3.0.09

Please fix it, if possible, in the upcoming release.
Thanks!