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Thanks. I'll try bandicam. By the way, I already have optifineWell, if your Minecraft is already laggy, then it would be hard to find software that does not make it lag more.
You can make your MC less laggy by installing the Minecraft mod optifine. Just Google it, I can't link as I am on my phone. Once it is installed, go through all of the settings in MC and turn them down to the lowest possible options, especially render distance.
After that, if there is no/minimal lag, its really up to you what video software you want to use. I use Bandicam, its free and I don't experience much lag at all when using it.