gantt views very slow with a long timespan project
When the first and last task have a huge time difference, the rendering becomes impossible slow. Starts to feel slow on a beefy machine with 5-10 years duration, very noticably slow with 20 years and impossibly slow with 40 years (now that that won't hit year 2038 problems).
We should hit it up with sysprof/perf a bit to see if anything can be done quickly in the GTK3 version. GTK4 with its widgets probably will be a different matter, but that's very very far away, so we should see about improving it in GTK3. Probably some low hanging things to fix.