Over time, Real Racing 3 accumulates cached files. Go to Settings → Apps → Real Racing 3 → Storage → Clear Cache (not Clear Data) to remove temporary files without losing progress.
Ensure the final structure looks like this: Internal Storage/Android/obb/com.ea.games.r3_row/://xxxxx.com.ea.games.r3_row.obb Features of Real Racing 3
Because Real Racing 3 uses a dynamic graphics engine that scales according to your device's chipset, manually installing files can sometimes default the graphics preset to low. To maximize visual performance or fix frame drops after manual installation, you can tweak the asset profiles:
/storage/emulated/0/Android/obb/com.ea.games.r3_row/