Mobile devices have limited resources compared to computers, so it's best practice to optimize PDF documents for use on mobile devices. This saves both storage and battery, and improves the device's performance.

The following two settings when exporting from Adobe Acrobat help to improve the performance of the PDF:

Reduce image size

Unnecessary large images can burden RAM memory of mobile devices, even if they are not displayed in their full resolution on the smaller displays of phones and tablets. Therefore, images should always be downsampled. In Adobe Acrobat this can be set in the File menu (1)> Save As Other (2)> Optimized PDF ... (3):

In the newly opened dialog box, you can change the setting to "Mobile" (4). With this preset, images are automatically optimized and converted for mobile devices:

Avoid JPEG 2000 for Image Compression

JPEG 2000 is a data format that is closely related to JPEG. It provides a slightly better picture quality with the same file size. The disadvantage of JPEG 2000 is the higher process overhead when decompressing the images. If JPEG 2000 is used, rendering search PDFs can take much longer.

Therefore, you should use Adobe Acrobat to check if your mobile-optimized PDF uses JPEG 2000 and if necessary compress it with JPEG. 

Edit> Preflight> Select "PDF Standards" in the dropdown menu (5). Select Analyze (6). A process will run.

In the "Results" tab, you can check the entries and see if JPEG 2000 was used (7). In the cases where JPEG 2000 was used, you should compress the images as a JPEG. 

To do this:

Open the PDF in Adobe Acrobat and navigate

File> Save As Other> Optimized PDF ... In the Images settings (8), select JPEG as the compression for color and grayscale pictures (9 & 10). Select OK