Make the timeline (i.e. x-axis) of the charts in the html report changeable, e.g. buttons for showing the last 10, 25, 50, 100 and 'all' tested data points.
Modern charts have a scalable time axis thanks to the STF/STA work: https://valkyrie.yocto.io/pub/non-release/20260813-58/testresults/buildperf-alma8/perf-alma8-vk_master_20260813090037_2bb062e403.html