Ah, duh, I see that now. That's what I get for commenting too quickly ;-)

The choice of stacked bar charts is also strange because the languages are not all comparable

> Every language has nqueen and matmul implementations. Some languages do not have sudoku or bedcov implementations. In addition, I implemented most algorithms in plb2 and adapted a few contributed matmul and sudoku implementations in plb. As I am mostly a C programmer, implementations in other languages may be suboptimal and there are no implementations in functional languages. Pull requests are welcomed!

So the point still stands that many charts doing one thing each would be better than fewer charts doing many things each

> many charts doing one thing each

Would not be a summary.

It would if you have some summary charts at the top that don't include all of the data, but just the key takeaways, with other charts providing more detail for discussion elsewhere

My apologies. One chart for nqueens and one chart for matmul would be fine.