It’s an order of magnitude faster. So TT3 would have to be like 1,000 faster than TT2 to even close most of the gap. If you’re not doing 30+ dynamic requests per second it won’t matter. On a heavy traffic site, 100–10,000+ requests per second it will be the difference between constant outages and transparent service; as long as everything else, like DB, is optimized/cached.

Update: Template::Alloy already runs older TT syntax much faster and it’s what I have used in the past.