Hi Richard,

As Vijay mentioned, it's best not to keep too many editors open at a time
(< 10), and to restart eclipse every now and then. We realize this is a
high inconvenience and are working hard with the compiler team to remedy
these issues.

There are two options you can use to boost performance as well:
- There is a mode for editors where you can turn off most services and only
get syntax highlighting, outline view and folding. If you have files that
exceed 1K lines, you might want to consider this. This is available in the
latest release (as of 10/26/2010). Simply go to "Preferences" -> "X10", and
check the "performance scalability" checkbox.
- There is a "Conservative Build" option that you may want to turn off
("Preferences -> "X10" -> "Compiler"). Conservative build overcomes some
shortcomings of the compiler by resubmitting every file that has no
generated artifact in a project for compilation on every build. If you turn
off this feature you will get better performance out of the builder, but
you might observe some glitches with incremental compilation (files that
should get recompiled as a result of change might not get recompiled). All
you need to do in such a case, is to do a "clean" every now and then, and
that'll put you in a clean state again.

Regards

Mandana Vaziri
IBM T. J. Watson Research Center
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