Slow Response under Windows8

Hi

since using Windows8 I get very slow responses from the Server (on 2 different PCs) in developing mode. Every response takes about 5 seconds.

=== 2013-08-19 16:50:38,989 [l0-5] INFO IDACall - Performing 1 operation(s)
=== 2013-08-19 16:50:38,989 [l0-5] INFO SQLDataSource - [builtinApplication.fahrzeugListe_fetch] Performing fetch operation with
criteria: {__gwt_ObjectId:301,what:101,crit:"6236",time:new Date(1376923837000)} values: {__gwt_ObjectId:301,what:101,crit:"6236",time:new Date(1376923837000)}
=== 2013-08-19 16:50:38,990 [l0-5] INFO SQLDataSource - [builtinApplication.fahrzeugListe_fetch] derived query: SELECT $defaultSelectClause FROM $defaultTableClause WHERE $defaultWhereClause ORDER BY $defaultOrderClause
=== 2013-08-19 16:50:43,845 [l0-5] INFO SQLDriver - [builtinApplication.fahrzeugListe_fetch] Executing SQL query on 'SQLServer': SELECT COUNT(*) FROM dsFahrzeugListe0 WHERE (LOWER(dsFahrzeugListe0.crit) LIKE '%6236%' {ESCAPE '\'})
=== 2013-08-19 16:50:49,900 [l0-5] INFO DSResponse - [builtinApplication.fahrzeugListe_fetch] DSResponse: List with 4 items

Why does it take 5 seconds when under Windows XP the Response was much quicker?

I'm using SmartClient Version: SC_SNAPSHOT-2011-01-05/Pro Deployment (built 2011-01-05)

Browser is Google Chrome Version 28.0.1500.95 m

Thank you for a solution.

Pius