Try this:
1. Open your DB
2. Clean the Log_DB > dbo._LogCashItem > dbo._LogEventChar > dbo._LogEventItem dbo._LogSchedule
I got laggs 2 on my High Server, but after Clean the Log's, the laggs are gone
my Server 2 x
Intel i7 Extrem 3,40 Ghz x8
16 Gb Ram
Warning: Do not forgot to make a Backup from the Logs
best regards