Device: DD-WRT V24 preSP2 build 15778

TP-Link WR941ND 400Mhz atheros 32MB, CPU not heavily impacted during the upload test

While I have only one DD-WRT to play with, I suspect it is not build related. It seems well known ChilliSpot has not been maintained for years, so I doubt it changes over the builds. Even (somewhere in the knowledgebase) HotSpotSystems wrote that Coova is better.