I cannot do any testing myself as I only had a free account. But I have been meaning to talk about these software’s.
First on my list is cFosSpeed, you buy a lifetime license, while you are only suppose to put it on only one computer I was able to put it on my skycomputer also with no problem cFosSpeed It should help with lag.
eBoostr, Is mainly for computers with low memory, but it may help to put it on your skycomputer. eBoostr, If you decide to buy it you want to get the eBoostr 4.5 Professional Edition as that version has the ram cache that you want.
On Steam you may want to check out CPUCores, and Dimmdrive
Your skycomputer is on a virtual hard drive so any files you can keep in ram should speed it up quit a bit, that is what the eBoostr ram cache does for you it keeps the most used files in ram. I have not used Dimmdrive yet, but I understand you can set up your steam games to use it, so it may be able to help your skycomputer. CPUCores I have not used yet, but it is suppost to get better proformance out of your CPU. May help on your skycomputer.
Controller Companion is another program I got from steam, that I don’t know if it would help. but I thought I would mention it.