Thanks for reaching out, and apologies for the delayed response. As Myra mentioned, please make sure that your system meets the Photoshop web system requirements shared here:
https://adobe.ly/45bnTfm
Additionally, please confirm whether the issue occurs only in this specific document or in all documents, including newly created ones. You can also try the following steps and let us know the results:
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Test using a different browser (Firefox, Edge, or Safari)
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Try opening Photoshop in an incognito/private window
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Connect to a different network (for example, a mobile hotspot).
Looking forward to your update so we can assist you further.