This should allow a speedup, but may cause errors...

nedtwigg · nedtwigg · commit 13700cbe4534 · 2020-05-07T15:14:35.000-07:00
diff --git a/plugin-gradle/src/main/java/com/diffplug/gradle/spotless/IdeHook.java b/plugin-gradle/src/main/java/com/diffplug/gradle/spotless/IdeHook.java
@@ -58,6 +58,8 @@ static void performHook(SpotlessTask spotlessTask) {
 						dirty.writeCanonicalTo(file);
 					}
 				}
+				System.err.close();
+				System.out.close();
 			} catch (IOException e) {
 				e.printStackTrace(System.err);
 				throw Errors.asRuntime(e);

Original file line number	Diff line number	Diff line change
`@@ -58,6 +58,8 @@ static void performHook(SpotlessTask spotlessTask) {`
`58`	`58`	`dirty.writeCanonicalTo(file);`
`59`	`59`	`}`
`60`	`60`	`}`
	`61`	`+ System.err.close();`
	`62`	`+ System.out.close();`
`61`	`63`	`} catch (IOException e) {`
`62`	`64`	`e.printStackTrace(System.err);`
`63`	`65`	`throw Errors.asRuntime(e);`