Bad rendering slowed down videos

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Proxy can be deceiving by its very nature. This is mentioned in our official documentation. The same goes for preview scaling. Each of these features take you further away from WYSIWYG. You can disable proxy for a clip in Properties

Proxy Editing

Introduction Proxy editing is the process of creating and using low resolution videos and images in places of the original or optimized (Convert to Edit-friendly) files. This provides the advantage that your computer has less work to do in realtime while editing: decoding, scaling, and effects. This is, quite simply, because there are less pixels to compute. Then, when you are ready to export, it will use the original (or optimized) files for full quality. Performance is optimal when the pre…