Spring MVC - how to solve large file upload problem?

Question

Angular

I use:
- ubuntu
- Tomcat (-Xmx10240m -XX:PermSize=1024m, maxThreads="500")
- SpringMVC
- package org.apache.commons.fileupload in dispatcher to accept file
- angular [$upload] ( https://github .com/danialfarid/angular-file-upload) I
write the file to the server like this:

FileItem item = (парсю реквест HttpServletRequest и получаю файл);
File uploadedFile = new File(filePath, item.getName());
item.write(uploadedFile);

Actions:
Try to upload 16 500mb files at the same time asynchronously.
Received result:
Files are loaded without problems, but the server slows down terribly, even forms are not loaded in another tab of the browser.
Expected result:
Normal operation of the application in other tabs, for other clients.