I get a slight slow down when first loading a new tab, but I never see the "please wait" message.
Once a tab is loaded, and I switch to a different tab that has previously been loaded there is not significant slowdown.
One thing that does affect loading is the amount of text and large sized images in a topic. The larger in size an image is in MB the slower the tab responds. I have found that running the image through a "reducer" such as PINGO makes a significant difference in image loading with little loss of quality.
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