The problem is that large canvases take much memory space. It's visible if a PDF page is large (e.g. map) or zoomed in (e.g. at 800%+ zoom). Currently we are limiting canvas size (#4834) for mobile device. However a proper solution will be to divide page into smaller canvases and render only visible parts.

It's mostly blocked by generating operator list based on crop area (useful for zooming heavy maps), but we can proceed without it, and try to render the same operator list on several canvases.