How do I improve timing when I process an Engineering Change Order (ECO)? - How do I improve timing when I process an Engineering Change Order (ECO)? Description To improve timing when processing an ECO, ensure that you turn on the Optimize Timing for ECOs option (Settings > Fitter Settings > More Settings). You will get the following message during ECO compilation when this setting is set to OFF: Warning: Timing-driven compilation is disabled - timing performance will not be optimized Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['novalue'] novalue novalue ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']