Indexing issues with large amount of files in folders?

Having this problem where if I plugged in my external hdd and open a folder that have many many videos in many folders it would then at one time would change all the video icon from VLC and MPC to plain file like the no/unknown extension file and it would hang the file explorer if I closes it. The files are still able to open if I clicked it and runs with no problem. I had to restart windows explorer using the task manager. But the problem would be still there even if after I already removed the external hdd. Restarting windows fixes this problem though.

 

So I found that after opening quickly from folder to folder(maybe 50+ mp4/flv video files you name it EACH folder.. and maybe 50mb at least for each vid) the windows loading bar up top at the path bar would load and stop at one point. I also found that the VLC icon for videos would stop corresponding with the bar up top. Ex : path bar loads 20% and stop there. VLC would show on 20% of the files in that folder and the rest would be unknown file icon.

 

So is this an index issue where the windows couldn't handle too much videos that it need to read and also output preview? Cause usually VLC/MPC sometimes shows a picture preview. Is there any way i can speed up the index for the videos or specific folder or external drive?

 

using windows 10 on ssd