One manufacturer who's been very consistent in producing excellent entry-level DSLRs is Nikon. Their D3XXX ... started with a DSLR, the D3500 features a helpful "Guide Mode" that will walk you ...
The Nikon D3500's startup time was quite good ... reflecting the added delay caused by the pre-flash metering. Manual focus shutter lag was faster than AF lag as expected, at 0.109 second.