Document loading performance improvements

[juliushaertl]

• Profiling of WOPI requests
  • checkFileInfo https://blackfire.io/profiles/4760d582-dc86-46d5-b336-03767894857a/graph
    • Nothing unusual, major impact is the mountpoint setup
  • getFile https://blackfire.io/profiles/3a0e473d-efe0-420a-b143-be4dbe577946/graph
    • Nothing unusual, major impact is the mountpoint setup and streaming the file content
  • putFile https://blackfire.io/profiles/cf7f306e-0bcf-43f6-bf17-ef27d2f95668/graph
    • Nothing unusual, major impact is the mountpoint setup, file write and the usual pre/post write hooks (versions/activity)
• Profiling of document endpoints https://blackfire.io/profiles/4e188a39-f497-4057-aa37-e77674873602/graph
  • Might not be requried to actually read the file Emit read hook instead of fopen for admin_audit #1957
  • Capabilities loading could be optimized -> Something for server
  • timeline
  • Remove shortFooter/longFooter to avoid unnecessary navigation loading server#30625
  • Avoid file system access on checking if an image exists server#30624
• Frontend javascript profiling
  • Replacing some jquery code with plain js might help there already
• Try to load less of the unrequired server scripts within the iframe
  • Avoid loading anything else than core scripts/styles on empty/base renderAs tempalte server#30472
  • Only load script if needed files_videoplayer#254
  • Avoid loading the script if not needed files_rightclick#126