@orses  The important data point is vertical refresh rate, not horizontal refresh rate.  The photo of your display's menu indicates that your vertical refresh rate is 60 Hz, which is the standard refresh rate for PC displays. I'm not sure why your other system behaves differently in this regard, but it should not create a problem.

objects look very blury on the screen , it takes them short moment to look sharp and focus

the only deafferents i found between the 2 computers were the KHz

and the intel  iris  plus graphics 

@orses  One additional note.  What actual display model are you using?  That is not clear from your images.  But if the native resolution of the display is higher than 1920x1080, then you will not be able to use it properly from an Inspiron 3593.  That system and a few other system models have a limitation that causes their HDMI outputs to be limited to 1920x1080.  That issue is acknowledged here.  Dell claims that those systems are "working as designed", but those systems were originally advertised as having HDMI 1.4 ports, which should allow 2560x1440 60 Hz and 4K 30 Hz, but when multiple users reported that they could not use anything higher than 1920x1080, Dell removed references to HDMI 1.4 from the documentation and advertising of those systems and then posted that article.  I personally think there was a design or manufacturing error that created this problem, since those systems were launched in 2019 and therefore should have supported higher resolution displays, since many systems that are years older and even only have Intel GPUs can run higher display resolutions.  But the 3593 only has an HDMI output for displays, since its USB-C port does not support video output.  So if your display uses a higher resolution than 1920x1080, then you will not be able to run it properly from that system.

@orses It sounds like the display is running at a lower resolution then.  See my second reply.

Hi,

I have replied to you from a private message.

-Gautam.

i am using acer ed273a

@orses  Yes, but it is capable of 144 Hz vertical refresh rate, which is much higher than the standard 60 Hz.  But your Inspiron system probably isn't able to use 144 Hz.  It is probably limited to 60 Hz.  So if you have been using a higher vertical refresh rate on your other system and now are only using 60 Hz, that might be why things look blurry to you and why you say things seem to take a moment to settle.  The kHz horizontal scan rate you are looking at is based on the resolution you are using and the vertical refresh rate.  If both PCs are using that display at its normal Full HD resolution but the laptop is showing a lower horizontal scan rate, then it is likely because the laptop is running a lower vertical refresh rate.  So once again, check the vertical refresh rate on both systems.

hey i am uploading pictuers from the dell latitude 7450.

the screen works great with this one 

@orses  Yes, notice that the vertical refresh rate in that case is 120 Hz. That is why the horizontal scan rate is also higher, since it is mathematically related to the vertical refresh rate and the resolution. But the vertical refresh rate is what causes the noticeable difference in performance. Unfortunately your Inspiron 3593 simply does not support 1920x1080 at 120 Hz. It will only run at the standard 60 Hz.

can i do anything that will make it look better?

@orses  No.  The Inspiron 3593 only supports 1920x1080 at 60 Hz.  And the photo you uploaded earlier indicates that the 3593 is already running that display at 1920x1080 at 60 Hz.  So what you are already seeing from your Inspiron 3593 is the best you will be able to get from that system.  If you want something better, you will have to get a different system.  As I already said, that system and a few other systems that were listed in the article I linked earlier have some sort of issue that creates this limitation, even though some older systems could do better, as you found.  But there is nothing you can do to improve how that system works with your display.

The vertical lines only works at 34 khz , can i do something about that?

@orses  At this point I’m repeating myself. So I will try to explain this one last time. The 34 kHz is the horizontal scan rate, not vertical refresh rate. But the horizontal scan rate is always the result of a calculation based on the resolution (1920x1080) and the vertical refresh rate. So the reason your other PC shows a higher horizontal scan rate is because it is using a higher vertical refresh rate, specifically 120 Hz. But your Inspiron 3593 does not support 1920x1080 120 Hz. It only supports 1920x1080 60 Hz. And because it is using a lower 60 Hz vertical refresh rate, the horizontal scan rate also shows as lower.

There is nothing you can do to get your Inspiron 3593 to perform like your other PC. The way the Inspiron is currently running is the best that you will be able to get from that system. If you want something better, you will need a different system. I realize that this is frustrating and unexpected because a newer system should not perform this way, but this is a known issue with that system, which is described in the Dell Support article I linked a while ago. So there is nothing else you can do here.