Rendering the table is too much performace heavy - using scroller

Aresak

Hello,

I'm using the scroller extension, and the table is rendering really poorly. Every scroll (even when there should be only 1 more row to be rendered) the render takes over an 1s. Once the render took about over 200s.

There is 750 records in total.

       .DataTable({
          fixedHeader: true,
          processing: true,
          serverSide: true,
          serverWait: 500,
          ajax: this._internals.url,
          scroller: true,
          deferRender: true,
          scrollY: "100vh",
          displayBuffer: 3,
          columnDefs: this._temporary.columns
        })

Data source:

draw: "1",
recordsTotal: 750,
recordsFiltered: 750,
data: [
 {
  0: "Column 1",
  1: "Column 2",
  2: "Column 3"
 },
 ...
]

There is not much columns requested/displayed (< 15).

In the columnDefs is te problem I believe.
Each column has a render property, which is causing this issue.

Render method that causes the issue:

render: function(data, type, row) {
 return row[0] // Case #1
 return "Test" // Case #2
}

The row parameter is of course the data itself of the row. So: ["Column 1", "Column 2", "Column 3", ...].
If I keep the return row[x], the rendering takes ages.
If I remove the return row[x] and instead add return "Test" the rendering is almost instant, so the problem is laying somewhere for returning the value in an array.

Do you use a different methods for rendering?
The method is there for future possible extra formating of the wanted columns. If I remove the method, it still takes the same amount of time.

Thank you

colin

A few observations:

1. If you've only got 750 records, you wouldn't really need serverSide - that's for when there are over 50-100k records.
2. serverWait - this should be within the Scroller initialisation object, it's actually scroller.serverWait but that would delay the request.

If that doesn't help, we're happy to take a look, but as per the forum rules, please link to a test case - a test case that replicates the issue will ensure you'll get a quick and accurate response. Information on how to create a test case (if you aren't able to link to the page you are working on) is available here.

Cheers,

Colin