Problems with preview mode

I noticed that onlyoffice supports preview on mobile devices, but the preview speed is very bad in some mobile devices with average performance. Is there a way to optimize it? Looking forward to your reply, thank you!

Document Server version: 7.0.1 (build:37)
Type of installation of the Document Server (docker, deb/rpm, exe):rpm
OS: CentOS Linux release 8.5.2111
Browser version: mobile Blink
android pad : Lenovo M10(HD)

Hello @uncle
Please provide us with details. If it’s possible, please reproduce the situation and record a videofile. Also please let us know exact browser version and exact Android version of your test device