Streamline its memory and CPU usage
The new Yahoo Mail interface is a memory and processor hog. The old one was sluggish, but the new one is noticeably worse. When I open a Yahoo Mail tab in my browser, it immediately grabs over 500 MB of memory, and the processor is so overloaded that my typing takes several seconds to echo. I guess you don't test this stuff with low-powered machines like notebooks. I'll have to go back to the old interface.
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