Pre-4.42: Merlin suffered from poor response time under heavy load (5 or more users searching simultaneously).
4.42 - Three changes:
- Client requests prioritized - searches/sorts get low priority.
- Merlin Toolkit data cache improved ("lookahead" feature)
- Server's timeslice adjustable.
- Dramatic improvement in response time from Merlin server during heavy-load situations.
- Changes are invisible - client programs don't need to be modified.
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