The plugin causes high I/O usage

Hi Markus,

I really love your plugin, it’s great!

However, I just noticed recently that this plugin causes high I/O usage every time I run it.

When it starts checking for dupes, the I/O usage jumps to the max limit, when I stop the process, the I/O usage drops to zero.
Is there a way to lower the I/O usage so I do not give heavy burden to my hosting?

FYI, my hosting allows up to 5120 KB/s of I/O usage, so when the plugin is running, the I/O usage is 5120/5120 KB/s

Thanks.

https://www.ads-software.com/extend/plugins/find-duplicates/