We store scripts in SAP Web Repository and notice that the performance decreases considerably when GuiXT is turned on. What can we do?

This is normally a script cache problem. To resolve it, please perform the following steps:

(1) Check that

Replication Yes
is specified in guixt.ini

(2) Check that

VersionNumber xxxxxx // some version number
is specified in the right esession.txt / session.txt

Please also see the documentation on VersionNumber for more details.