It would help to know what game(s) you are talking about. Did you download DOSBox from dosbox.com? Have you changed your conf?

This happens in all games. I've downloaded it from dosbox.com, yes. I've changed the config a little bit but really only to change cycles amount, up and down. Moreover I didn't chance the config when the issue suddenly happened.

Resetting the configuration file doesn't help this, to clarify. 0.73 seems to partly work.

Trying changing the priority in the dosbox conf file from higher,normal to normal,normal . Most games from GOG are set to higher,normal. I find that there is more a problem of "keyboard stacking" (where holding down a key for one second generates like 4 seconds worth of repeated characters) than lagging, where as in a real vintage PC it would just start beeping at you for holding it down that long.

See also How to increase keyboard response time in Dosbox?

The other possibility (I'm trying to figure out if the poster is describing a latency problem, or a video problem) is that if it look like it's a frame behind, check if double-buffering is turned on or off and switch it. Because that IS effectively what double buffering is.

Hi, thanks for the reply.

I just tried it on normal,normal but that doesn't work, unfortunately.

I can't see an option for double buffering anywhere, what should I look for? The only "buffer" thing I could find was "prebuffer=20" which I tried setting to 0 and to 1024, but neither worked (if anything, it got worse).

In the conf file:
fulldouble=false

That turns off double-buffering.

Wow, that fixed it! Thanks so much! 😁

EDIT: I should add that I switched it ON rather than off, and that fixed it.

Good that you were able to fix it.

Can you list your complete system specs on which you faced this problem? It might be helpful to tackle the issue in future, with similar setups.

I'm running Windows 7 on an i5-2500 @3.3 GHz. Video card is a GTX 560 Ti.