T0biasCZe: Android MTP is extremely slow... so I made my own application with C# and ADB thats 28x times faster. Perhaps you may also find it useful... :D
Fast Android <-> Windows file manager using ADB protocol - T0biasCZe/AdbFileManager
I was getting tired of the mtp throwing errors half the time, the directories loading two minutes (not exagerating), the copying taking taking hour, so i said screw it and made my own file transferer that uses ADB, which doesnt rely on the slow as MTP. I made it primarily for myself, but since i already made it why not share it :D
From my testing (over USB 2.0) of copying 8.4GB pictures folder, with my app it took 4m08s, approx 286Mbits/s. With MTP, it was showing it will take hour and 3/4, aprox 10Mbits/s https://github.com/T0biasCZe/AdbFileManager/releases
edit: To go up a directory, double click the list header!
Once you have adb installed, you can just adb pull FILE to get a file from your device to your PC, or adb push SOURCE DEST to move it to the phone, not perfect since it's command line only though...
You can also use adb shell to get a standard UNIX shell on the phone