As part of improving performance we have disabled the substring matching of source package names. This fixes bug 268508 and bug 607960. However its a slightly contentious issue – opinions vary about whether bug 268508 is a valid bug or not.
So we have only disabled it – the code is still present and when we have more leeway on the performance of bug searching we’ll revisit this and look into some design and UI analysis to decide whether substring matching of this sort should be done or not.
For now though, there should be less timeouts in bug searches.