Comment by badmintonbaseba
13 hours ago
We didn't use Saxon, I don't work there anymore. We also supported client-side (browser) XSLT processing, as well as server-side. It might have helped on the server side, maybe could even resolve some algorithmic complexities with some memoization (possibly trading off memory consumption).
But in the end the core problem is XSLT, the language. Despite being a complete programming language, your options are very limited for resolving performance issues when working within the language.
O(n^2) issues can typically be solved using keyed lookups, but I agree that the base processing speed is slow and the language really is too obscure to provide good DX.
I worked with a guy who knew all about complexity analysis, but was quick to assert that "n is always small". That didn't hold - but he'd left the team by the time this became apparent.