Minecraft – Does Tekkit support 1.5.x

Remember that RedPower pneumatic tubes will only send items if the source is open, so you can save yourself from overflow with those. Otherwise, for the items with an EMC, condensers are great for collection. For the other items, you could use obsidian pipes leading up to some recyclers, and put the product of that into your mass fabricators (assuming you're using them). You could also just have some obsidian pipes leading to a bunch of chests, and you can go through later and sort out what you need and don't need, or you could have machines do it. In a pinch, if you just want to get rid of waste to prevent lag, lava always works.

If you are playing with a pack that includes ExtrabiomesXL, stay away from the redwood forests. The leaves of the redwood trees extend further from the trunk than vanilla Minecraft allows, meaning that upon entering the biome, hundreds of redwood sapling entities are created and dropped. While these can be great for early fuel, rendering all them absolutely kills your FPS.

Perhaps this is what caused your 2-3 FPS while killing (or being killed by) the wolf?