Hello, It seems that with eric4 version 4.1.6 the editor is very slow. Perhaps I have some incompatibility among versions? Python: 2.5.1 Qt: 4.4.0 PyQt: 4.4.2 sip: 4.7.6 QScintilla: 2.2 eric4: 4.1.6 (r2290) Regards, Juan Pablo