Hello, I have problem with thread UniOPCThread, which takes about 40-80 % power of 3-core Athlon II processor under Windows 7 Professional After OPC server starts everything is ok, but after start of visualization software (Control WEB or Reliance) with about 900 tags (400 MB, 400 MI and 100 ML) threand UniOPC takes this part of processor operation power. I tried it also on the other computer with Intel i3 (4-core) and problem was the same, just it was about 30-50 %. There is no write cycles in scripts, just if there is write on screen in visualization, there is write over OPC to PLC. After I close Reliance (vis. soft.) it is always a message of UniOPCThread - "Error 111 - Overflow" and I must "kill" Reliance in processes manager. I tried run UniOPC.exe and UniOPCThread in compatible mode Windows 7 and Windows XP SP3 mode, but result is the same. No antivir was installed in those tests. Do you have solution of this problem ? Thanx a lot !!