dir-600 lag spikes

[dep3kuj]

Hi guys,

Having this really nasty problem, that I have really annoying lag spikes on wireless connection (and wired as well). Spikes occure only when I am gaming online (like WoW) and 2 other devices use the network (samsung tablet and an old pc). When someone is watching movies online on the tablet I have like 1000ms lag spikes every 2-3 minutes. The download speed is constant thow, was downloading 3 games while using tablet, no prob. But gaming...

When only my pc uses internet - everything is smooth. But when the tablet with online movies comes in... daaamn.

The internet speed is 100 down and 100 up mbit. Even when tablet is in use the Okla speed test shows 70-90 mbit down and up speed on my pc with5-15 ping. But still I get lag spikes. in games.
In my pc I have some trendnet PCI wireless card with an antenna (150/150 mbit speed) and the router is D-link dir 600 (3 or 4 years old).

How can I tweak router to eliminate those spikes or I really need a new router?