Hi Colin. Apparently, I found the problem. It was related to the amount of libraries that are in the folder /home/pi/.node-red/lib/. In the menu in the upper right corner "= > import > library" many libraries would appear. I think it's a problem to have many libraries in this folder. The Web browser has difficulty loading all and hangs up for a few moments, until it loads. After deleting these libraries, which i´m not using, the web page instantly loaded! Even the raspberry pi is working without much processing load now.
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