If you have issues with slow rendering, try changing the Renderer.
Select File > Project Settings > General > Renderer and change the setting to Mercury Playback Engine GPU Acceleration.
If the Mercury Playback Engine GPU Acceleration option is dimmed or not available, then check if there is any update available for your GPU drivers.
Delete the preview files and check if the preview works. You can delete render files within Premiere Pro, or by navigating to the folder where they are saved, and deleting them from that location.
Click File > Project Settings > Scratch Disks. Look for the location specified for Audio/Video Previews. Navigate to that location in macOS Finder or Windows Explorer, and delete the preview files from that location.
If you delete previews you need to rebuild them manually (Sequence > Render In to Out), otherwise the playback might become choppy.
Many issues that are related to playback and performance are linked to the Media Cache and Media Cache Database. Media Cache contains the.CFA and.PEK files that are generated by Premiere Pro while importing clips for the first time in Project bin. Clearing cache files can help in solving such issues. Follow these steps to clear the cache files.
With Premiere Pro closed, navigate to the location of the Media Cache Files and Media Cache Database and delete the files manually. After you delete the files, empty the trash. For information on how to free up hard disk space by removing cached media files, see Managing the media cache database.
To check if an effect is responsible for the reduced performance, disable the audio/video effects applied on a sequence to ease the processing load. You can then enable these effects again when you export.
Use Global fx mute button in the Program Monitor to mute all effects at once. Or, disable the effects individually from the Effect Controls panel.
For more information, see Remove Audio/Video effects in Premiere Pro.
Check the MediaCore folder to verify whether the installed plug-ins are compatible with Premiere Pro 2019.
For Windows, the files are at:
For macOS, the files are at:
Macintosh HD/ Library/Application Support/Adobe/Common/Plug-ins/7.0/MediaCore.
Check the System Compatibility Report (Help > System Compatibility Report) in Premiere Pro and see if there are any hardware compatibility issues. Alternatively, check the Premiere Pro System requirements page.
If the system is not able to process the media and the effects applied in real time, it may result in reduced performance. In such cases, try the Proxy Workflow in Premiere Pro to use the proxy functionality and switch between native and proxy formats to get the job done faster.
Sometimes you may face issues where the playback doesn’t work after hitting the play button. Usually, such issues occur due to Audio Hardware not being configured properly.
Select Edit > Preferences > Audio Hardware, to check the computer audio device and the Device Class settings (ASIO/MME for Windows OS or CoreAudio for macOS) that is used by Premiere Pro for audio playback and recording. For more information, see Audio Hardware preferences.
Check for external audio devices in the Default Input/Output and try to disable them. For example, you can disable external mic, Webcam, third-party audio playback devices such as AJA or BlackMagic, USB MICs, or monitor speakers.
On Windows machines, try to disable all the devices except Realtek listed under Sound Control panel.
On macOS, try to create an aggregate device by selecting built-in input/output devices and then select that aggregate device as Default Input/Output under Audio Hardware preferences of Premiere Pro.