Why is NIOS II running slowly on my Cyclone V design? - Why is NIOS II running slowly on my Cyclone V design? Description Due to a problem in the Quartus® II Software version 12.0 and 12.1, NIOS® II designs may run at a reduced maximum frequency when Embedded Multipliers or LE based Multipliers are selected. Resolution A patch is available to fix this problem for the Quartus II Software version 13.0 and 13.0sp1. Download and install the appropriate patch from the links below, then re-compile your design in Quartus II. Quartus II 13.0: For Windows: Download the Quartus II software version 13.0 Patch 0.21 for Windows (.exe) For Linux: Download the Quartus II software version 13.0 Patch 0.21 for Linux (.tar) Readme: Download the Readme for the Quartus II software version 13.0 Patch 0.21 (.run) Quartus II 13.0Sp1 For Windows: Download the Quartus II software version 13.0sp1 Patch 1.01 for Windows (.exe) For Linux: Download the Quartus II software version 13.0sp1 Patch 1.01 for Linux (.run) Readme: Download the Readme for the Quartus II software version 13.0sp1 Patch 1.01 (.txt) Custom Fields values: ['novalue'] Troubleshooting n/a False ['Nios® II Processor'] ['FPGA Dev Tools Quartus II Software'] No plan to fix 12.0 ['Cyclone® V E FPGA', 'Cyclone® V GT FPGA', 'Cyclone® V GX FPGA', 'Cyclone® V SE FPGA', 'Cyclone® V ST FPGA', 'Cyclone® V SX FPGA'] ['novalue'] ['novalue'] ['novalue']