Thanks - I have been monitoring the Raspberry Pi's current frequency by looking 
at: /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
Even after adding force_turbo=1 to config.txt and rebooting, cpu0 never seems 
to scale above 600
A closer peek at
$ sudo cat /sys/devices/system/cpu/cpufreq/policy0/*
shows that some of the cores will occasionally hit 900, 1200, 1400MHz  so 
you're correct that the CPU frequency support in the kernel is working.

It seems that Gnome Shell / wayland drags down performance on the Raspberry Pi 
so much that opening Firefox takes 10 minutes.  I'd prefer to run Gnome but its 
unbearable. I've done a
$ sudo dnf groupinstall lxde-desktop-environment
and LXDE performance is much better.
-- John
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