I noticed that my Cisco Jabber became very laggy when typing and sending chat messages. A little google-fu found this page from Cisco. Apparently Microsoft’s KB3038314 is the cause of it. I uninstalled the KB and Jabber is back to it’s snappy self. I’m running the latest version of Jabber (10.6.3) and I hope that Cisco can get around this in the next version.
Update: It looks like the lag is fixed in v10.6.4 build 63238.