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Is there a limit for column families per cluster/keyspace beyond which cassandra performance will decrease significantly? I know we've had some problems with earlier versions, and somehow reducing number of column families solved the problem.

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See http://www.datastax.com/dev/blog/whats-new-in-cassandra-1-0-improved-memory-and-disk-space-management which says:

"Cassandra 1.0 only uses one memtable setting: memtable_total_space_in_mb (found in cassandra.yaml), which defaults to 1/3 of your JVM heap. Cassandra manages this space across all your ColumnFamilies and flushes memtables to disk as needed. This has been tested to work across hundreds or even thousands of ColumnFamilies. "

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