On 4 Sep 2007, at 17:16, Jan Melichar wrote: > A while back a number of people commented on my problem and I think > that I have traced it to iCal. I now have 2GB of memory on the G5 > so the spinning disk and slowing down is less of a problem but on > the office G4 with 1GB memory the problem starts the moment I > launch iCal and goes on for a good 15 mins. According to the > Activity Monitor SynchServer goes into overdrive. In the case of > the G5 it swallows up 95% of the CPU (in the top pane) or 45% user > (in the lower pane). Hi there, I suggest that on each machine you synchronise you open iCal & "export" (from the file menu) each schedule as a .ics file. This is a "plain text" version of the iCal database (you need to manually export a separate one for each iCal calendar). Delete all computers from your dot-Mac account and clear all data from it. Delete all your calendars in iCal & reimport them from the .ics files. Try again synchronising them. There are instructions in Apple's user-support forums on how to clear out the iCal database by deleting the appropriate files & directories within "~/Library". Likewise for the iSync cache. It is quite a chore to undertake all this, but I have found it solved synchronisation problems for me in the past. You should do all this before posting again further. My guess is that the underlying problem is that the iSync service is so slow & rubbish. This is surely down to Apple's servers, as I have always known everyone complain about it over the course of a number of revisions of OS X. My own tests involved using my desktop to place a single PDF file (of a few hundred k in size) into my dot-Mac iDisk (or whatever they call it) and synchronising that across to my laptop. After hitting the "Sync now" button several times, alternatively on each machine, and waiting for the "sync" to finish the PDF file had not shown up. I was pretty pissed off by this stage & gave up in disgust; the PDF file had not turned up the next day and when I noticed it there on my laptop it was already far too late to save my opinion of dotMac. I have to admit that synchronisation of iCal appointments did always go pretty smoothly for me - much better than the PDF file I just described. Usually I could simply enter an appointment on my desktop PC, hit "sync", and whilst I was getting ready to go out that would finish so that I could hit sync on the laptop. Most always the appointment would appear (fairly) immediately on the laptop - the problem was that when it didn't I'd often end up on the other side of town, opening my laptop and looking for the street number only to find no details of the customer (keeping the address & phone number of the customer in the iCal entry). Now I manage my schedules by exporting my schedule (as I described in my first paragraph) and transferring the .ics file to the other machine. This isn't proper "synchronisation" as it doesn't properly merge schedules - I need to always remember which computer holds my current "master" iCal schedule, lest I overwrite the wrong one. Mostly this means I just make all entries on my desktop and transfer a copy of the schedule to my laptop (so I can read-only entries whilst I'm out), but if I add an entry in my laptop I need to remember to make a transfer to my desktop before adding entries to it (or changing any existing ones). In my house this works pretty well because email sent to my own addresses never leaves the house - there is no upload & download to an external mail server, so the message (and attachment) appears immediately in my inbox. It is indeed more fiddly - to export, drag & drop the file, transfer it between computers, drag & drop the file again before finally importing it - than it is to click a single "sync" button, but I have found this method works for sure everytime, so it is worth it for me. Stroller.