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The grid benchmark from the Google spreadsheets team is slow
The google spreadsheets team does a variety things to make gigantic spreadsheets responsive in the browser, including not even loading the whole spreadsheet into the DOM at once.
They provided Darin (and through Darin, me) a tiny benchmark which use innerHTML repeatedly to update a table, in a similar manner to how at least some versions of spreadsheet handle scrolling.
Looking at this microbenchmark in a sampler shows some low hanging fruit which I've filed as separate bugs and blocked here.
Created an attachment (id=154365) [details]
grid microbenchmark from spreadsheets team
If this is a revised version of https://github.com/dglazkov/performance-tests, Juilen has been working on some of the issues. Are you guys coordinating? :)
This is some html file Darin sent me via email yesterday. I've been CCing Julien on bugs.