Engine Status Version Time (ms) Hosted by
Go Go AppEngine (status)
Haskell Haskell regexplanet
Java Java AppEngine (status)
JavaScript JavaScript AppEngine (status)
.Net .Net AppHarbor
Perl Perl ZEIT (status)
PHP PHP AppEngine (status)
PostgreSQL PostgreSQL Heroku (status)
Python Python AppEngine (status)
Ruby Ruby ZEIT (status)
Tcl Tcl ZEIT (status)
XRegExp XRegExp AppEngine (status)

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The engines should be very responsive: they do not hit a database or do anything but calculate regexes. They should never take longer than a 1 second (1,000 ms in the table above) unless there is a problem with the regex (or the host). Response times of less than 0.1 second (100 ms) are very good.