Thanks for details.
For PHP and ASP, we recommend to use the out-of-process option (Local Server). This is because otherwise a new copy of the component might get loaded with each new request, causing unnecessary connections to/ and disconnections from the OPC server.
To do so, run the EasyOPC-DA Options utility (from the Start menu), and on the System Parameters tab, uncheck the "COM Registration: In-process server" box, and make sure that the "Local server" box is checked, as on the attached picture.
If you already have the settings precisely as on the picture, let me know and we will have to search for another cause.
When measuring the times, please exclude the the first call - that one may take longer, because of the same extra work needed to set up the connenction initially.
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Hello.
In general, I would consider 2-10 seconds to be quite slow. However, let me please ask some additional questions, and I will then give you better targeted reply:

How many items are you reading roughly (in one call)?
Are you using QuickOPC-COM component registered as Local Server, or In-process?
Have you changed any QuickOPC settings from their defaults (either using the EasyOPC-DA Options utility, or by setting properties in your code)?
Have you tried to reach your OPC server using some other OPC client, and if so, what kind of performance do you see?
Can you post the relevant parts of your code?

Many thanks