Good news for all you folks out there on Ampere® Altra® & Altra Max® systems, Michael Larabel of Phoronix (Michael Larabel - Phoronix Media | LinkedIn) has uncovered a nice set of performance bumps available easily from the Ubuntu 25x release (GCC 14x, Kernel 6.14 etc.) Run on a System76 Thelio Astra Workstation using an ASRR board at 1DPC.
Presumably available on other distros. Fedora 4x is getting there with GCC 14/15 now but still back on kernel 6.11.
Overall performance averages out on Michael’s tests at 20% up with video transcode seeing almost double the performance! Someone has been beavering away 
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That’s a nice performance bump ! 
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Impressive performance jump
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I would wait for Ubuntu 26.04 with LTS kernel 
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Apparently point release 24.04.3 in August will bring the 6.14 kernel to 24 LTS. No need to be so patient.
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And, out of the box, Ubuntu beats Fedora…
https://www.phoronix.com/review/ubuntu2504-fedora42-ampere
Hints at the reasoning:
Fedora 42 though is on the new GCC 15 compiler unlike Ubuntu 25.04 sticking to GCC 14. On the System76 Thelio Astra there is also an important difference that Ubuntu 25.04 defaults to the cppc_cpufreq driver with the ondemand governor while Fedora 42 defaulted to cppc_cpufreq with the Schedutil governor for relying on kernel scheduler utilization data.
