Ongoing from bug 125624 working with attachment 151516 [details] pagination with paragraphs and headers/footers composed of mixed CJK and Western text runs performs poorly. The UI will stop responding to scroll and page motions, and the <Ctrl>+G "Go to page" dialog will stop responding. Actual page composition becomes corrupted.
Changing zoom level does not clear the corrupt page layout. Nor does changing between view modes (Single page, multi-page, book view).
Pagination on initial opening is good, but advancing into the document (scroll or page dn) and then backing up starts to degrade.
On Windows 10 Home 64-bit en-US with
Windows 10 Home 64-bit en-US (1809) with TB39
Version: 126.96.36.199.alpha0+ (x86)
Build ID: 9870ff897f088563426bee9567dd9cb722c2b929
CPU threads: 4; OS: Windows 10.0; UI render: GL; VCL: win;
Locale: en-US (en_US); UI-Language: en-US