ImageJ becomes very slow after running for a whileThere are several reasons ImageJ can run slowly on macOS. TroubleshootingSee also the Troubleshooting page. See also the Java 8 page for OS-X-specific issues. It turns out the steps from the README file which came with the installer include instructions only for Unix and Windows , but not for OS X / mac OS.
Java 8 Upgrade To TheApp NapWith macOS version 10.9 “Mavericks” and later, there is an “App Nap” feature which dramatically slows down applications that are not in the foreground. Make sure you are using the latest version of Java 8, as well as the latest version of ImageJ. Window menu bar bugThere is a bug in Java 8 on macOS which causes the application to drastically slow down as many windows are opened and closed over time. You should either upgrade to the latest version of Java 8, or revert to Java 6 (see “Frequently Asked Questions” below).![]() How do I run ImageJ with Java 6?It is unfortunately no longer feasible to install Apple Java 6 on current versions of macOS. Frequently Asked QuestionsSee also the Frequently Asked Questions page. This JDK bug discussing the issue.As a workaround, you can check “Use JFileChooser to open/save” in the Edit › Options › Input/Output… dialog. If you find a solution that works, allowing ImageJ to run fast in the background, please tell us on the forum!) No title bar in file chooser dialogsOn macOS 10.11 “El Capitan” and later, the operating system no longer includes a title bar for file chooser dialogs. (There are also various ways to disable App Nap on your machine, but we have not had much success with them. Versions of java starting with jdk1.8.0 should support JavaFX. Then go into the java/macos folder. You can check the version of Java packaged with ImageJ2 or Fiji by right-clicking the app and viewing the contents. How do I run ImageJ with JavaFX support?Whether JavaFX is supported on macOS depends on the version of Java that is used. If you have difficulties, please post on the Image.sc Forum.At any time, you can verify which Javas are installed on your system using this script. Mac os x emulator for windows security updatesIn this case, you can add JavaFX support by replacing this will the Azul JDK that comes with JavaFX included as described here.
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