To PDA plugin working normal. You need prepare environment and server has performance below:
Server #
PHP version: 5.6+
Writable file & folder: Upload and cache folder path
Memory: You need set minimum 512MB or bigger (recomment bigger than 1GB)
Post & uploads: You need set minimum 10MB or bigger (recomment bigger than 50MB+)
Website #
WordPress version: 4.9+
WooCommerce version: 3.7+
Why server requirements? #
While working with tools, it doesn’t require a little resource from the server. The progress base on your client’s performance. But some task need process by server (Upload photo, render file, orders…) Capacity data is big sometimes.
So when processing, the server has to use the number of resources to process them. The server will needs to process essential things:
1) Amount data can put to the server based on users data. PHP has setting post_max_size, upload_max_filesize, max_file_uploads and max_input_vars to control that. So, you need setup it bigger for responsive request of customer.
2) Another thing is the memory for PHP process. It may use 512MB or bigger of RAM in short time.
We need to increase the PHP setting to increase available memory. PHP has memory_limit to control it.
How to setup value of PHP? #
You can login to Cpanel and you can change all value required easy. Also, You can change value by edit the .ini file (edit file by file manager or ftp).
If you still don’t know how to setup. You can ask your host support change it or upgrade server if requirements still not enought.
We supported check requirements status and recomment setup value on dashboard page like bellow:

You can Read more detail of advance configuation from this document