Enabling Link time optimization (LTO) with
rpmbuild is one of the new
features of Fedora 33. I read the changeset
page once and went back only
after I did the Tor package builds locally.
While building the package, I noticed that suddenly there are many processes
/usr/libexec/gcc/x86_64-redhat-linux/10/lto1 and my load average reached
55+. Here is a screenshot I managed to take in between.