I experienced a freeze which can be reproduced very easily on
GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.18, cairo version 1.16.0) of 2020-08-25 .
- Copy the Unicode U+27B0 into the scratch buffer: ➰
- Emacs frozen for a whole minute and displays ➰.
Remarkably, the response time for other symbols in this Unicode table is quite different, e.g.
- ➑ takes 30 seconds
- ➐ is instant.
Is this issue known?
Profiling & Benchmarking
Unfortunately, this scenario escaped the profiling...
...and the benchmarking which outputs immediately the result when the symbol is not yet present.