CPU bloat when rolling over a clip in Playlist Window

[Balage]

I have noticed that in the latest release of FL Studio 11 (11.1.1 x86) CPU usage goes unnecessarily high when you simply roll the mouse cursor over a clip in Playlist Window. It is also noticeable on the Output Monitor Panel. It becomes slow, loses its smooth motion, even jams for a second. In Task Manager I can see that when this happens, one core is entirely used at 100%. Since it completely eats up one core, it can significantly decrease overall performance and the amount of CPU resources available for meaningful tasks, for instance running VST plugins.

Tip: To me this seems to be an improperly written or unoptimized event handler of the widget of an audio clip that is triggered on every mouse move.

Additional facts

• This is not present in the latest release of FL 10 (10.0.9c) that provides the same functionality in Playlist Window in the feature scope the bloat is present.
• The CPU usage is normal when not rolling over a clip but just moving the mouse inside the Playlist Window.
• The bigger area the visual representation of the audio clip covers, the higher the CPU usage goes when moving the mouse over it.
• The CPU usage when rolling over with the mouse is much higher than horizontally scrolling / moving the whole canvas with the middle button.

Reproduction

• Open FL Studio or start a new project.
• Drag & Drop an at least 2-minute-long audio clip into the Playlist Window.
• Zoom in both horizontally and vertically to have the biggest area covered by the clip.
• Start moving your mouse cursor within the area of the audio clip.
• You will notice the high CPU usage.
• You can also start playing in SONG mode and see how the high CPU usage affects the smoothness of other visual elements.

Environment

I tested latest versions of FL 10 and FL 11 on OS Windows XP SP3 32-bit and the following hardware.
Processor: Intel Pentium T4500
Memory: 3 GB
Display card: Intel GMA 4500 (integrated)
Display resolution: 1366x768
Laptop model: Lenovo IdeaPad G550L

[gol]

The bigger area the visual representation of th...

[Balage]

Meanwhile I created two short demonstration vid...

[gol]

I see why it happens, the clip (any) that you'r...

[Balage]

Thanks. If you have any questions regarding th...