Excel slows down when network drive is mapped

Since a couple of months we are experiencing strange behaviour of excel (2011) on Lion 10.7.5
Excel versions from 14.3.1. to 14.3.4 all the same behaviour.
Symptom 1)
When I connect the Time Capsule drive , Excel slows down by factor 100 when entering text. Needs up to 2 seconds to react on a key stroke.
When I disconnect the handle, excel works fast again.
(repeatable, reproducible)
Symptom 2)
on the network drive, always at the same place, a file named ~abcde.xls... occurs (exact name forgotten, but it is a recent file name
preceded with a tilde sign)
deleting of the file does not affect speed
the file reappears occasionally (TC backup is switched off!)
Where is the ghost??? :-D
maybe these symptoms are uncorrelated.
Why the heck does Excel slow down when I open the network drive??
Why does this happen on 10.7.5 and not on 10.6.8?
Anyone any idea?
thanks,
Stefan

Thanks. Away on holiday right now, but will do it as soon as I get back next week.
Out of curiosity, the external drive works fine when connected directly via USB to the laptop. I took that to mean that the problem wasn't to do with the drive, but probably the network. Is it possible there could be a problem with the drive which only shows up when it's used as a network drive?

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