# Impact of UDT usage on performance **URL:** \ **Category:** Ignition\ **Tags:** ignition81, perspective\ **Created:** [November 2, 2022, 10:48am UTC](https://forum.inductiveautomation.com/t/impact-of-udt-usage-on-performance/65987 "2022-11-02T10:48:08Z")\ **Posts on this page:** 1\ **Showing post:** 3
**Author:** ![m.pelagatti](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/m.pelagatti/32/68595_2.png) [@m.pelagatti](https://forum.inductiveautomation.com/u/m.pelagatti)\ **Post date:** [November 8, 2022, 9:16am UTC](https://forum.inductiveautomation.com/t/impact-of-udt-usage-on-performance/65987/3 "2022-11-08T09:16:13Z")
Hi, read this post > [@Opc and Leased Tag Group](https://forum.inductiveautomation.com/t/opc-and-leased-tag-group/55655): > > Hi to everyone! I have a problem with Opc Ua and Leased Tag Group. Inside my project I have too many tags with OPC (about 2900 tags) and this cause the tag quality to be “Good\_Overload” when the system drop the scan frequency to ensure the readability of all the tags. I would like to know if there’s some way to decrease temporarily the scan frequency of the Opc Tags. I have tried to use the the leased tag group in order to slow the update of hidden tags, but it doesnt work: I see the tag updatin… is not possible to use derivative tags to read a document and use leased tag group, because each derived tag request information to document tag , and is the same like it's showed in a page. I'm in testing another tag group but driven, and request tag only with a bit (for me it's a cycle.started) ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/2/f/2f8e8e7e2fc36ede1012557eac9b5f3ba981f807.png) i use this group in document tag and all tag connected to this cycle. When bit is on , refresh is 1500ms, when is off refresh 3000ms Tell me if is useful for you. --- _[View the full topic](https://forum.inductiveautomation.com/t/impact-of-udt-usage-on-performance/65987)._