[NETBEANS-3666] Excessive amount of CPU used in multitab UI

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 11.3
• Component/s: ide - UI
• Labels: performance pull-request-available
• Assignee: Karl Tauber
• Reporter: Laszlo Kishalmi
• Created: 04/Jan/20 05:56
• Updated: 05/Feb/21 21:01
• Resolved: 22/Jan/21 19:14

Description

It seems there is a performance bottleneck in multitabs implementation.

org.netbeans.core.multitabs.impl.TabDataRenderer.getPreferredWidth(Object) is being called several times spending considerable amount of time setting the text on a JLabel over and over:

https://github.com/apache/netbeans/blob/06b3e677d9ea4dbd9987c8245fe5be776e8245f8/platform/core.multitabs/src/org/netbeans/core/multitabs/impl/TabDataRenderer.java#L144

The purpose of these calls is to properly measure the width of the rendered component.

Issue Links

• links to: GitHub Pull Request #1848