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Here are some ways to decrease the server and client side burden while uploading numerous files:

Use a file compression utility. This can greatly reduce the size of files, which will reduce the amount of data being transferred during the upload process.
Implement client-side validation. Implementing client-side validation can reduce the amount of data being sent to the server, thus reducing the server-side burden.
Use AJAX to break the upload process into smaller chunks. This will allow the server to handle smaller portions of the file at a time, which can reduce the server-side burden.
Use a CDN (Content Delivery Network). This can distribute the load across many servers, reducing the server-side burden.
Use asynchronous uploads. Asynchronous uploads can reduce the client-side burden as the user can continue to use the application while the upload is in progress.
Use serverless file transfers. Serverless file transfers can reduce the server-side burden and improve overall performance by allowing the client to upload files directly to a cloud storage provider.
Cache files on the client-side. Caching files on the client-side can reduce the amount of data being transferred during subsequent uploads.