You need to tweak the composer media optimization image bytes optimization threshold to disable the client size optimization of images below that size. The default applies to images above 500Kb, so you want to increase that setting to 1.2MB.
You need to tweak the composer media optimization image bytes optimization threshold to disable the client size optimization of images below that size. The default applies to images above 500Kb, so you want to increase that setting to 1.2MB.