I've used Fujitsu 6130z's and Kyocera MFP's (FS-3140 specifically) however this was across a local LAN. We have P25's as well however it's still slower than scanning on a PC and we do set DPI and color down to make the files smaller. The thin client sounds like a good idea, something with an embedded OS to act as a buffer before sending the file over the internet. For that matter a cheap PC with the view client installed might offer better performance.
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