Hey everyone, noobie here. Decided to join BTC mining just for fun and not for making money (though it should be good too). I used to do a lot of Folding and SETI back in the days, and when I saw some "affordable" ASIC miners, I decided to jump in and got myself a measly 4Gh total (2 USB Antminer U2)

So some questions here, I am using MultiMiner using the ASIC (I disabled GPU option) and it says I have 2Gh on each (under "Current" column), with 1.5Gh (under "Effective ") and total Gh shows as "3.1". These values fluctuate as well but not too far from those (give or take .1 to .2 difference). However, whenever I check the webpage, my hashrate shows less than 1Gh (i.e 875Mh as of last 10 rounds). I have been running them for 24Hrs now, so I don't know how many rounds that is.

My specs:
Two(2) Antminer U2 (2Ghz each), plugged to USB hub. No errors ($30 each), not overclocked
Host PC is an old Centrino laptop, running 2Ghz CPU, Win7 2GB RAM, connected to net with old WiFi (802.11g)
I use Stratum protocol
MultiMiner software, calling BFGMiner with standard parameters on COM3 and COM4

* So is it normal I get less than 1Ghz for 10rounds?
* Is using an old laptop on old WiFi a bad idea? (I can watch Netflix HD movies without hiccup, but huge file transfer is a no-no)
* Should I run these ASICs 24x7? Or do they die fast if I do run it like that?
* Should I wait for a week to get my actual hashrate?
* Why do my score keeps getting reset?

Thank you and sorry for noob questions