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Indeed this thread is initially about instrumenting playback with actions. I moved your message here.

Indeed the high speed camera setting has no effect on playback speed, it just changes the time base used to compute time values.

The resulting maximum reacheable framerate will depend on the bandwidth of the video (size of images and frames per second) and on the encoding format. The encoding has a great impact on the decoding time. If decoding + display cannot be done in less than the frame interval, frames are skipped. If this repeats constantly, the speed slider is automatically brought down.

In recent versions, the decoder tries to use the display size so that the image can be rendered without interpolation as fast as possible. Try to decrease the size of the image with the corner handles to see if it mitigates the problem.

Grouping would be definitely interesting. It'd also be interesting in the context of creating a custom tool out of existing ones. However at the moment it's still not planned for short term.
One question will be: how do you know if the user is dragging the mouse to create a selection or just trying to move the image around.

Regarding pencil tool, merging the pieces of the drawing would be easier to implement as a short term mitigation of the problem.

Regarding temporarily hiding a drawing or a group of drawings, how would you "unhide" it ?

The way it works for now is that each time you manually moves a point, it will reset the series of saved positions for this point. From that moment, it will start tracking the new point.

You make a very good point about the pencil tool. At the moment there is no secret function to fix the problem.

Holding down a key would be a solution but I'm not sure if it would be very convenient while drawing.

Another idea would be to automatically group the new pieces of the drawing with the existing pencil pieces of the same color on that image. So until you change color, or change key image, the pencil would be adding to the existing group. On a given image, all pencil pieces of a given color would actually be a single drawing.

Or be in this additive mode only until you switch to another tool. This would allow to have several groups of the same color.

Thanks for the sample files, it is helpful.
The slowdown/freeze is coming from the fact that upon loading the kva, the file is seeked to create the key images thumbnails on the fly. It will inevitably slow down the loading. Worse, on some formats seeking itself is problematic and can take even more time for each seek.
The final feature shouldn't necessarily create key images, just overaly the data in real time.

When using the perspective grid, it would also be interesting to be able to treat KVA files themselves as input for an overlay, to provide the view of data as seen from above.

Don't really have time to dive into this right now, but it solves several recurring needs so it's definitely climbing the todo list.

Hi,
Thanks for working on this.
Could you send me some sample files so I can later look where the slowing down is coming from ? If you send the .kva I guess I can load it on my own 10min video and see what happens. Having the gpx would be interesting too.

There is certainly a lot of interesting things to do in this area. Overlaying raw data, graphs, cloud of points, or maybe even maps would be super cool.

The spec for .KVA files can be found in the source under Tools/XML/Schema. (online here).
I admit it wasn't really thought out to scale to 500+ key images…

You can also disable fading entirely, the drawing should only be visible on the exact key image it is attached to.
<InfosFading>
            <Enabled>false</Enabled>