Why does File Explorer Seem to Wait for End-to-End Confirmation?

Question

For quite a few versions now, when copying large blocks of files from place to place it seems like Explorer adds an arbitrary delay or maybe waits for confirmation internally that every file has been actually written to the disk before continuing.
On a modern computer with plenty of RAM for cache and a massively powerful SSD-based I/O system (capable of sustaining gigabytes per second of throughput),
why should we ever wait for a copy of a few hundred megabytes of files?  Theoretically it should complete in a second or two. 
In fact, back on XP one could observe exactly the behavior I'm describing - file transfers - especially on hard disk but even over the network - would proceed at a very breakneck pace.
Yet it's not uncommon to see miniscule transfer speeds while copying groups of files that even the oldest, cheapest hard drive could sustain...
What's the setting to have Explorer stop waiting and just get on with the copy, filling the cache with the data to be written later?  Some of us don't want to wait that extra minute to get the job done.  I know whomever programmed the cutesy
little graph wants to make sure we all see it, but...
-Noel
Detailed how-to in my eBooks:  
Configure The Windows 7 "To Work" Options
Configure The Windows 8 "To Work" Options

Answer 1

Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
*Do NOT click the Reset button on the Safe mode start window or otherwise make changes.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
You can check for problems with the places.sqlite database file in the Firefox Profile Folder.
*http://kb.mozillazine.org/Bookmarks_history_and_toolbar_buttons_not_working_-_Firefox
*https://support.mozilla.org/kb/Bookmarks+not+saved#w_fix-the-bookmarks-file
You can check for problems with the sessionstore.js and sessionstore.bak files in the Firefox Profile Folder that store session data.
Delete the sessionstore.js file and possible sessionstore-##.js files with a number and sessionstore.bak in the Firefox Profile Folder.
*Help > Troubleshooting Information > Profile Directory: Open Containing Folder
*http://kb.mozillazine.org/Profile_folder_-_Firefox
Deleting sessionstore.js will cause App Tabs and Tab Groups and open and closed (undo) tabs to get lost, so you will have to create them again (make a note or bookmark them).
*http://kb.mozillazine.org/Multiple_profile_files_created
Create a new profile as a test to check if your current profile is causing the problems.
See "Creating a profile":
*https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues
If the new profile works then you can transfer some files from an existing profile to the new profile, but be careful not to copy corrupted files.
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox