It depends on the problem and what is used to compile the native executables, f.i. on pure maths like the Mandelbrot set, FireFox and especially Chrome were giving Delphi XE2 a good sweating a few months ago:
http://delphitools.info/2011/09/02/f...t-performance/
FreePascal was in the same ballpark as Delphi, but I haven't tried since, it would be interesting to see if it has since caught up with the JS engines.
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