What is the maximum number of columns and rows supported by DataTables?

Is there a limit? Currently, my tables have 300 plus columns. Just curious.

Ditto on rows.

I'm noticing too long export times when rows get over 300.

For export, I'm using ...

buttons: [ 
{ extend: 'csvHtml5', text: '<a title="Save table to .csv file.">Save</a>', filename: 'export_label', exportOptions: { columns: [ ':not(.label):visible' ] } }              
]

Even though the eventual .csv file is only maybe 500 KB.

Thoughts?

Thanks in advance.