extenion file of ai open by adobe reader print question

@ektrontek This could be due to the complexity of the .ai files, which often contain high-resolution graphics, complex paths and gradients and embedded fonts.

To improve performance, you can try adjusting a few settings in Adobe Illustrator and Adobe Reader.

Adobe Illustrator: Simplifying your Illustrator file by reducing the number of points and paths, as complex artwork can strain resources. Secondly, decrease the resolution of raster effects, which can significantly impact file size and processing time. Also, hide or delete unused layers, swatches, images and objects to minimize the amount of data Illustrator needs to handle. 

Adobe Reader: First, try simplifying the print output by selecting "Print as Image" in the advanced print settings. This will rasterize the .ai file, making it less complex for Reader to process. Second, consider reducing the print quality, which will decrease the file size and potentially speed up printing. Lastly, ensure that both Adobe Reader and your printer driver are updated to their latest versions, as updates often include performance improvements and bug fixes.

Granted, if you are printing for CMYK, you really don't want to use low-resolution images, you do want CMYK images at 300ppi. The old saying, garbage in, garbage out!