1) Please close other unnecessary applications during the conversion, otherwise it may take large memories and CPU of your computer to slow down the conversion.
2) Choose the profile from Profile list, click the Settings button and set the output parameters on the Settings window lower. Note that this will reduce the output quality.
3) If you have NVIDIA graphics card, 2nd generation Intel graphics card or AMD graphics card and their latest graphics card drivers on the computer,you can go Tools->Options->Conversion on Leawo, check the “Enable NVIDIA GPU Acceleration” option. For more details about the NVIDIA CUDA, please check /nvidia-cuda.html.