Issue with WriteableBitmapEx.Blit API

Apr 26 at 5:07 AM
We are using WriteableBitmapEx library (version - 1.5.0).
From this library, Blit API is used to merge source writeablebitmap to the destination writeablebitmap destination.
This Blit() API is taking 60-100 seconds to execute, which is resulting very slow performance.

Code snippet for reference :
Rect srcRect = new Rect(0, 0, bitmap.PixelWidth, bitmap.PixelHeight);
Rect destRect = new Rect((frame.PixelWidth - bitmap.PixelWidth) / 2, (frame.PixelHeight - bitmap.PixelHeight) / 2, bitmap.PixelWidth, bitmap.PixelHeight);
frame.Blit(destRect, bitmap, srcRect, Windows.UI.Xaml.Media.Imaging.WriteableBitmapExtensions.BlendMode.Mask); //where frame and bitmap is writeablebitmap object.

Issue is observed on Phone only.
If we run the app in debug mode, API takes around 5 seconds.
If we run the app in release mode, API takes around 60 to 100 seconds. Sometime more than this.

We are expecting your suggestions on this for an alternate solution or any modifications to be made to correct this API work.
Apr 26 at 5:18 AM
First of all think about how you phrase your expectations for a free open source project where we as contributors put our free time for free into it to make a product that can be used commercially without any royalties.

What you observe is likely a side effect of .NET Native since it's not observed in Debug mode. The NET Native Team has a fix for this that is available in a preview build. Nothing we can do.
Apr 28 at 12:26 PM
Thanks for your valuable timely response on this.
We appreciate your valuable time & hard work on this.
Thanks a lot.

Can you please confirm the NET Framework version I can pick from -