Add a note to the perf documentation about rotation (#6585)

docs/general/performance.md

@@ -3,6 +3,7 @@
 Chart.js charts are rendered on `canvas` elements, which makes rendering quite fast. For large datasets or performance sensitive applications, you may wish to consider the tips below:
 
 * Set `animation: { duration: 0 }` to disable [animations](../configuration/animations.md).
+* [Specify a rotation value](https://www.chartjs.org/docs/latest/axes/cartesian/#tick-configuration) by setting `minRotation` and `maxRotation` to the same value
 * For large datasets:
   * You may wish to sample your data before providing it to Chart.js. E.g. if you have a data point for each day, you may find it more performant to pass in a data point for each week instead
   * Set the [`ticks.sampleSize`](../axes/cartesian/README.md#tick-configuration) option in order to render axes more quickly