Adobe Reader is very slow after I resize the window on my Windows 10 laptop. This includes maximizing and restoring down a window. If I only open one document, it usually takes 1-3 seconds to respond, depending on how complicated the document is. This is already significantly slower than Firefox and Chrome. Furthermore, if I open two documents, resizing takes 3-6 seconds, and longer when more document tabs are opened. This is a big performance issue. Looks like Adobe Reader is rendering all the documents synchronously after the window is resized, which is completely unnecessary; it should only render the current tab synchronously and render the other tabs in the background.

The two problems add up and cause significant performance issue when I try to move the window between monitors. The window often get stuck for at least 10 seconds, because it will do the inefficient rendering several times; one time for resizing the window on one monitor, one time for changing the scaling because two monitors have different DPIs, and one final resizing for maximizing the window on the new monitor. This results in an unacceptable "not responding" freeze.

I do hope Adobe could improve the performance of PDF rendering. The current version is really wasting me so much time waiting for the frozen window.