@mcbridematt Running at 1.2 GHz makes a big difference. Thanks again.
Sorry for my ignorance, but looking at this table (from https://community.nxp.com/pwmxy87654/attachments/pwmxy87654/imx-processors/161806/1/NXP%20LS1088A-1386069.pdf)
Does it mean, that if CPU frequency scaling was working, the CPU frequency could go as low as 600 MHz?