Important CPU and memory usage when zooming
Bug #2012678 reported by
Sébastien Lamy
This bug affects 1 person
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
qpdfview |
Opinion
|
Undecided
|
Unassigned |
Bug Description
On a small configuration (Atom processor 1.8ghz, 2GB RAM), When zooming a lot on page with an image build with different layers (something like a map with different layers of informations), qpdfview consumes a lot of RAM and CPU and display goes blank before it can show anything. I tried various pdf viewer, and this is a quite common issue. I found another open source program that has not this issue : xpdfreader. But the UI is not as good as the qpdf one.
https:/
Maybe you should consider using the same pdf renderer ? (I suppose this is XpdfWidget/Qt)
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Over this problem, there is a "redraw" behavior that is quite agressive, that seems only to occurs when big zoom factor (500%) causes drawing latency.
I.E when moving another window in the desktop, the qpdfview window redraw all its content, becoming blank while redrawing, and then showing the same thing as it was before. CPU jumps just to redraw an already drawed image.
Same thing occurs when minimizing windows and the maximizing again.
I join a sample pdf, to use with zoom at 500%