Citrix Secure Gateway over https reverse proxy - mouse delay

Hello,

i've a citrix secure gateway 3.1 server behind BM 3.9 SP2. I've configured a https reverse proxy to the gateway webserver. the citrixfarm is in our internal lan. My problem is, that i've very strange delays in citrix applications with mouse movement. The delay is about 1-2 seconds. If i connect directly from the DMZ to the gatway server, no delay was happend? So, my idea is, that the reverse proxy is the problem? Any idea would help!

Is it possible to create filter exceptions, delete the reverse proxy, and connct directly per SSL to the citrix secure gateway server. If yes, can anyone tell me the filter exception rules.

Thanks for your help!

Regards,
Norbert