Wednesday, January 21, 2015

Re: GWT 2.7 performance issue

Much to our surprise the test show a quite large performance hit. For example a simple test running three for loops inside each other took almost 50% longer with 2.7 then with 2.6.1.

What work are you doing inside these for loops? If these loops are empty or only do local, useless work it might be a bug in code pruning, e.g. GWT 2.6.1 has removed the for loops from the final output while GWT 2.7 keeps them. You can check that by comparing the final JS output (compile with mode PRETTY).

Can't remember any commit to GWT that might cause a 50% performance drop, especially as GWT now has a new benchmark system in place to detect performance regressions.

-- J.

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