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Build Identifier: RAP 1.4 M4 Text field assists in RAP have a severe performance problem. When typing fast, the rendering of the characters typed slows down significantly after a few keystrokes. Reproducible: Always Steps to Reproduce: 1. Create a text field. 2. Create an IContentProposalProvider which always returns an empty array of proposals 3. Create a ContentProposalAdapter for the text, the IContentProposalProvider and the default TextContentAdapter 4. Enter text into the text field very quickly (e.g. keep your finger on a key) After a dozen of characters, the rendering of the characters slows down significantly.
ContentProposalAdapter is heavy use of key events. When you create a ContentProposalAdapter, a key event listener is attached to the text widget. For every key press on the client a new request is send (immediately or after a delay) to the server. The issue with the bad performance is related to these bunch of requests, but this is a known limitation of the key events. The fix is to rewrite (if possible) the ContentProposalAdapter to not use of key events, but modify events only.
I think that this issue has been fix with the bug 367871. DOM key events are not canceled automatically anymore and re-fired again after getting the result from the doit flag. Please reopen if the issue persists with RAP > 1.5M5.
