I have been using USB Safely Remove since 4.7.1, and it is working good.
I tried both version 5.0.1 and 5.1.2, both having slow response. There is delay like 10 seconds for any action related to USB Safety Remove program, i.e. point the cursor over the icon, it takes 10 seconds to pop out the device list; right click on the icon will take 10 seconds then only the menu appears; similar to double click the icon.
I revert back to the older version 4.7.1 for the time being.
Having basically the same problem with version 5.3 - so slow as to be practically unusable, and intermittently stops responding altogether. In shutting down or rebooting Windows often has to kill it because it won't exit. I've since downloaded 4.7 and installed it and it seems to be working fine, albeit with less functionality. I'd be fine with using the old version, but I had to PAY for the upgrade and can't even USE it! If I'd known that 5.3 had these issues I'd have just kept my old version and not paid for another 6 months of upgrades. Also, original post was made two years ago. Why has no one ever responded to it? Is anyone even paying attention to these issues?
Update: I found the installer I'd originally used to install 126.96.36.1995 last year before I replaced the hard drive and had to reinstall the OS. This version is also runs quite slow now, but at least is fast enough to be more or less usable for the time being. I will observe its behavior for a few days and then post a bug report from the UI.
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