Lets keep a few things simple here... Aloha and Micros are the top 2 POS systems in the world. Micros for PMS and Casinos, Aloha for hospitality, always battling for spot #1.
EGI will not effect loading of the terminal. EGI turned on makes the screens paint going from screen to screen. I believe the issue is loading, is it not? A Debout will tell you all phases of the process, but rarely do I lean on them for troubleshooting, unless it is something major.
I would recommend plugging it directly into the switch, and make sure you are using a 10/100 switch. Hubs are fine, but the signal is bounced across all ports, whereas a switch learns. Slow loading is usually RAM, or an incredibly large database. Network can affect it as well. Get a little creative with it, start with 1 terminal, and then move forward.
Brad C.