Load Image faster in asp.net

The slowness issue might be related to the images’ size and format that stored in the DB. If this is the case one possible solution would be change the format, compression and the size of the stored images.
For example, if you are saving the images as any uncompressed format, try to compress the images data and save it with a suitable format such as TIFF_LZW, PNG, JPEG 444, etc.

You might face problem with the desired format, since not all formats are supported with ASP.NET classes. In this case you might need to use an imaging toolkit like LEADTOOLS that supports wide-set of format and compression.
For more information see the following links:
https://www.leadtools.com/sdk/formats/web-services

http://demo.leadtools.com/JavaScript/Viewer/