REAPER users on MacOS 10.13 High Sierra have been reporting seeing this warning popup

“reaper_host_i386” is not optimized for your Mac. This app needs to be updated by its developer to improve compatibility.



Many users have been reporting this on the user forum and the REAPER lead devs Justin and Schwa explain in a few posts

It’s warning about REAPER’s 32-bit plugin hosting bridge, which is a 32-bit application that exists to let you run 32-bit plugins within 64-bit REAPER. The warning is correct — the 32-bit plugin hosting bridge is indeed a 32-bit application. Not much we can do about that! Schwa

The 32-bit bridge is also used for QuickTime support, you can disable this in preferences/Video by removing the “qt” text from the decoder configuration string. Justin

So there you go, nothing to worry about, it’s just the 32-bit plugin bridge and QuickTime video decoder.

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