Custom Boot animation slows, freezes and crashes phone

I've created a custom boot animation: 1. Create animation with Blender, render all the frames 1080 x 1920, PNG. 2. Convert them to JPG. 3. Store frame 0 to 123 to folder part0, store frame 124 to folder part1. 4. Create desc.txt with content (every line ends with ``): 1080 1920 24 p 1 0 part0 p 0 0 part1 5. Store all that into bootanimation.zip (mode: Store), almost 10 MB. 6. Copy it onto the SD card and copy it to /system/media/ with TWRP. When I reboot the phone, it displays the animation okay, but then slows down (still during the first loop), halts, and reboots after a few seconds. Is there anything I've done wrong? The phone is a Fairphone 2, running Fairphone Open with the newest TWRP and encrypted data partition.