The Video compressor drop list on the Bolisoft Screen Recorder allows you to select the CODEC, which will compress your pictures to make AVI files smaller and enable them to play faster, as it is shown in the figure below:
Please note that if you want to record AVI files in True Color mode (24 or 32 bit), the default Microsoft Video 1 compressor will still write them as 16 color bitmaps, losing some of the color resolution. You may experiment with some other video compressors that are installed on your system.
For recording in 16 bits per pixel (65536 colors mode), you could try using Intel Indeo Video codec, which will be about 10-20% faster in compressing, than MS Video 1, the "Auto-Select" choice of Boilsoft Screen Recorder.