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As shown in #28752, init of editor is really time consuming task, equal in time to deserialization time of all top components on workspace of average user. Peter Zavadsky claims that main problem is thet even only text editor kit is requested, all kits are fully initialized.
Could you be more specific? If I open txt file in editor, only PlainKit and PlainOptions are initialized. If I open java file, only JavaKit and JavaOptions are initialized. If the several files with different content types are open in editor and i.e. java file is "selected" (visible in tabbed editor), then only JavaKit (JavaOptions) is initialized after deserialization during startup, provided that the file is in the first tab. If not, some other kits (not all) are also initialized but from stacktrace (that I am attaching) is clear, that the problem is not in editor module.
Created attachment 8251 [details] stacktrace of editor kit creation. There is also the time of kit+options initialization. (Sometimes it is more ;-))
Additional info to the stacktrace: second tab, that contained txt file was selected. The first tab was java file. Third xml file, fourth jsp file...
UI responsiveness of first file opening has been already filed as the issue #27710 As for the problem of all kits initialization, it works OK for me.
This can be closed, as other more specific issues (issue 27710 and other mentioned there) are taking care of this.