If you want to help debugging apps that don't properly hide their launch splash (usually because they don't submit their activation token) consider setting the newly added PHOSH_DEBUG=app-activation in ~/.phoshdebug.
This increases the splash timeout significantly and if you then spot an app that seemingly takes > 20s to start you can either report it to the app developer or hop onto Phosh's Matrix channel first, so we can double check if it's not triggered by anything else.
Note that fixing this also helps on desktop as activation for these apps usually doesn't work properly there either, it's just not that noticeable as there's no launch splash.
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