FYI, i've found 'emerge -pvuUD world' is 7-9% faster on my machines when I compare 3.10 to 3.11b4.
To achieve this i've added '*/* PYTHON_TARGETS: -* python3_10 python3_11' to package.use on my ~arch systems, then run 'emerge -avuUD portage'. At the end of this python-exec.conf contains; python3.11 python3.10 and when i run 'emerge --version' it shows that 3.11 is being used. Alternatively you could put 'python3.11' in /etc/python-exec/emerge.conf and comment python3.11 out of python-exec.conf if you want 3.10 to be the default and 3.11 to just be used for emerge.
