I only wonder if the external tasks are compiled with
that same option,
but that is beyond TW control.
They might not use LTO, but BOINC apps are usually quite well optimized,
there was for example an entire community around optimizing the client
for SETI@home.  Some of that ended up in the upstream application.
Many BOINC apps are open source and I'm sure they will happily accept
contributions, especially if they improve performance.
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