WPS very slowly when typing with ibus vietnamese

I have installed WPS Office 11.1.0.10161 from official website with .deb package. When I typing vietnamese by ibus-unikey iput method, it's very slowly to display what I typed. The problem occurred in WPS Writer and WPS Presentation, but every thing work fine in WPS Spreadsheet. How can I fix it? My system is ubuntu 20.04 and Kernel Version: 5.8.0-50-generic.

I have the same problem with you when I was using WPS downloaded at official website and trying to type Vietnamese with ibus-bamboo. But since I changed to use WPS snap package then its working very well with me: app starting faster, no more ibus-bamboo issues, maybe this can help you.