Quickleaf
Legend
5 players total, although last Friday there were only 3. We play Essentials only, use Group Initiative and I cut HP by about a third for all monsters.
We're finding our groove, which has been about a 10 month process.
Huh. 5 in my group too, mostly non-Essentials, I pre-determine monster initiative, and halve monster HP for standards (among many other monster tweaks). Thing is this particular group came together just last month thru a bit of serendipity, and we started at 6th level with new PCs, so we're still in the learning phase.
What are some of your tricks?15-45 minutes been the norm for us, so far. But I don't throw a leveled encounter at them every time and have gone to lengths to shorten combat. It's an ongoing process.
Well before Friday I need to assemble and paint 20 skaven GW minis (posing as wererats). Maybe when the PCs see all of them traipsing around a retreat could be sounded.... Then again they just might yell the name of their deity, flip over a cot, and attack the wererats en masse.I await it expectantly!

A sneaky reference to the 2e PHB's introduction to D&D.
[MENTION=98255]Nemesis Destiny[/MENTION] I've noticed the same thing in 4e. A game with 3 or 4 players goes noticeably faster than 5 or 6 (of course), but my sense is it's exacerbated by something systematic in the rules.