LAN is internal and speed will be whatever your LAN allows, both directions. Other Speedtests are for WAN connections to determine if any Tweaks can be done for Internet (WAN) connections based upon your speeds give for your ISP (WAN). They are two different things. SpeedTestDOTnet is for WAN and LAN has nothing to do with PC<->PC LAN connections. Having a Website on one and accessing it from another on LAN is "immediate" (LAN/NIC/Router) speed.
Try this -
1 - Create a Website on PC-A - set it up with (e.g.) NO-IP (for dynamic IP updates)
* - don't forget to Port Forward on your Router
2 - Access it on PC-B using "HTTP://n.n.n.n" (replace "n's with PC-A IP)
3 - Now go "elsewhere" and access the Name (given in e.g. No-IP)
Amazing the difference in access time, isn't it?
Edited by submix8c, 30 June 2013 - 05:52 PM.