problem with Basic Web Services (BWS)

I have a problem: I have a website with links to other pages. Some go to an iframe, and another opens in a separate window. Sometimes when I open several times, notably the link to the separate window, the browser stays (IExplorer) without receiving any response from the server. So, I close the browser, and returns to work.
I have several pages (7) Web images, each page load about 18 images of 2k.

NET 7.3 eclipse
DIGI Connect ME
BWS web server. example “Http Managed Server Sample”