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My Late 2013 iMac (Catalina 10.15) is struggling to run either Lightroom Classic or Photoshop - both applications are inordinately slow to open, sometimes taking tens of minutes and similalry sluggish when editing, making it almost impossible to use. Is there anything I can do to speed things up or do I need to upgrade my system. Thanks in advance.
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I believe you're at the point where a system upgrade will be a mandatory step if you want to continue running Photoshop and Lightroom Classic.
Photoshop now requires Big Sur, and recommends Ventura. See the full system requirements here:
https://helpx.adobe.com/photoshop/system-requirements.html
Lightroom requires Monterey. See the full system requirements here:
https://helpx.adobe.com/lightroom-classic/system-requirements.html
Newer hardware, especially newer GPUs, are a must for the newer versions.