
Without opening up a project, go under the Resolve Help menu and choose "Create Diagnostics Log on Desktop," park that on a file-sharing service, and post the link here so the support team can check it out.
You might also provide all the info: which hardware (CPU, GPU, RAM, disk I/O)? What specific version of Resolve? What OS? What source file codec? What timeline resolution? What framerate? How does your drive rate with Blackmagic Speed Test? Which GPU drivers are installed?