Success! Looks like we've fixed this one. According to our records the fix was applied for EXTJS-7993 in 5.0.0b1.
  1. #1
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    Default 4.2.0 Beta Stateful Array Grid Example Row (style rows on mouseover)

    4.2.0 Beta Stateful Array Grid Example Row (style rows on mouseover)


    /* style rows on mouseover */
    .x-grid-row-over .x-grid-cell-inner {
    font-weight: bold;
    }

    Active row change is very slow

    Browser: Chrome
    Version: 23.0.1271.95 m

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    It's not slow.

    The adding of the class is delayed until mouse movement ceases.

    This is a performance improvement. Adding classes cause layouts.

    It's not worth adding the class if the mouse is moving over the grid.

    The eye candy appears as soon as you stop scrolling or moving the mouse.

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