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It take a long time to convert a dwg file to png with high resolution

I have some problems in converting DWG file to PNG file with aspose.cad 20.9.

I try to convert one part by part using CadVportTableObject.
if I set the pageHeight and pageWIdth 10000 or less than 10000 and the resolution 0.25, It will take a long time more than 60 minutes。

I need the resolution of the png more than 0.25. Because I want see the detail.Is there a relationship between the time it will take 、the resolution and the pageSize?

My computer:
64bit win10;Memory: 128G;CPU:intel Xeon 6230 @2.1GHZ * 2

The promgram、the dwg file and the log are here:
http://219.142.30.254:8728/ChinaCoalSafety/Question20201107.rar

@cuipz_coalinfo_net_cn

I have created an issue with ID CADNET-1244 in our issue tracking system to further investigate and resolve the issue. This thread has been linked with the issue so that you may be notified once the issue will be fixed.