There are two task execution modes: parallel and serial.
Parallel execution will start all tasks at the same time when a new operation begins. For instance, when decoding ten encoded files, all ten decode operations will be started simultaneously. Parallel execution mode is recommended only for powerful computers, and can improve performace on multi-processor systems with good memory.
Serial execution will start tasks one by one, wait for the completion of each running task, and then start the following task. When decoding ten encoded files, there will be ten steps to the decode; as each file is decoded, another will start decoding.
To set task execution modes:
Click Options, then click Technical.
Check Parallel Mode for parallel execution and Serial Mode for serial execution.
Click OK to apply the settings.