You can display the folders that have the most amount of files and folders with this Shell script. In Linux you have a limited numbers of inodes and this can be a problem if you have too much of files, especially if they are very small and you have a limited disk space.
This shell script displays the absolute path to the folders with the most amount descending. All files on the operating system will be searched.
find / -xdev -type d -print0 | while IFS= read -d '' dir; do echo "$(find "$dir" -maxdepth 1 -print0 | grep -zc .) $dir" done | sort -rn | head -50
Give the script executable rights and run it. It will take some time to display the results.
chmod +x ./my_script.sh && ./my_script.sh