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Zoom (in) function with selected layers significantly slower in newer releases #1453

Description

@matthias-vorwerk

When compiling and using latest klayout release 0.28.10 and opening a larger layout the right mouse zoom in function, but also keyboard based zoom in functionality has longer delays.

CentOS7, self compiled QT5 + klayout 0.28.10, removed $HOME .klayoutrc

The effect is as follows:

  • open a large layout
  • full hierarchy depth (*)
  • show only one selected layer, then add a second layer to show
  • try to zoom in (and out + in again, several times)

now: when zooming in often the zoom in shows significant delays.
BUT When I Show All layers. there is no such a delay. Showing only 2..3 individual layers again shows the zoom in issue.
This is very reproducible with different layouts, uncompressed GDS sizes used for tests: 3..5 GB

Then I compiled previous releases and it looks like this is happening since klayout 0.28.8.
It still works fine in 0.28.7.

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