How do I speed up my wifi?

OK, im living downstairs in a 3 story house. I'm not sure where the router is located but the wifi seems to be half slow everywhere. I tested it and it has about 10-15 down and 10 up on my pc with a wireless adapter. Compared to my old wifi this is decent but I still lag. Even in Minecraft lol. I have good ping... show more OK, im living downstairs in a 3 story house. I'm not sure where the router is located but the wifi seems to be half slow everywhere. I tested it and it has about 10-15 down and 10 up on my pc with a wireless adapter. Compared to my old wifi this is decent but I still lag. Even in Minecraft lol. I have good ping and then it jumps to 300ms and then back to 60ms. This happens every 10 seconds. So yeah what can I do to speed up my wifi, boost signal or even make my computer a priority on it.
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