any major performance improvements in SubSonic 3.0.0.4 vs 2.1?

Is it worth upgrading to the latest stable version of SubSonic over 2.1? We are running into some performance and scalability issues that are quickly becoming unacceptable and I haven't really been able to find anything definitive that points to anything that could really help.

I'm going to see if I can harness out some testing models but thought I'd ask.

tha开发者_StackOverflow社区nks.

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Don't know if this will help, but I have found a major factor in write performance depends on the presence of default values in tables. Subsonic 2.1 performs a SELECT against the database for each value when creating a new record, and these can really slow things down. It wouldn't be too hard to write a patch to cache these if constant (clearly you don't want to cache 'SELECT GetDate()', but 'SELECT 1' isn't going to yield too many surprises). Not sure what 3.x does here; I haven't gone there yet.

This may be of no use if write performance is not the issue, but in that case more info would be good.