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* other: group all dataset draws in a time chart We used to draw each data set separately as a new canvas. Now, in one canvas, we draw all datasets. Note that this changes how dataset lines are drawn - rather than drawing one on top of another, it now draws kinda all at once. This effect is *kinda* a bit better IMO, but it might also look a bit more cluttered. * other: optimize truncate_text Flamegraphs showed that this area seems to be a bit heavy at times with some inefficient use of iterators and collection. This change should hopefully optimize this a bit by reducing some collections or reallocations. There can also be some further optimizations with less allocations from callers. * Reduce some redundant draws