It does, yep. There was mention about a certain percentage increase, but I don’t have the citation on me right now. It was either through the RDC19 presentation Lua As Fast As Possible or on one of the Luau release threads. I’ll edit the post if I can find it.
EDIT
Video starts at the performance improvements chart with benchmarks. Look at the top two entries of the table on the right. As for discussions regarding pairs/ipairs, you can actually see a lot of them via the VM beta thread (I saw you took part in those conversations too actually).
https://devforum.roblox.com/search?q=ipairs%20topic%3A298659
Does this answer your question?