You are looking at the wrong page. Those are the 2018 results, and they are clearly a mess:
IDL is 1000-2000x faster than Julia, while Python grows faster for larger problems (by a factor of 10x!!)
And then, for the Jacobi iterative solver, look at this
IDL is suddenly 80x slower than Julia…
Those results are garbage. Instead look at the 2019 results for Gauss-Legendre:
(2019-results here: https://modelingguru.nasa.gov/docs/DOC-2783)
Julia blows IDL and python out of the water. IDL still makes no sense, though. Look at how the runtimes change for different problem sizes.