I have bought the MBP PRO 2020 13" after lot of struggle convincing my family for lot of money. Thinking it would help me ease my work and help me with my work.

However,The problem is I feel like I have made a blunder on taking the decision. I have Dell P2719H 27" Monitor and Logitech M331 Mouse.

I have used HDMI Cable to connect to my External monitor and tried costly HDMI cables as well (Belkin).

The mouse is very sluggy, I tried to move my pointer one place to another place. pointer became big and suddenly stops.

I'm feeling frustrated after an invested lot of my money in this thought that I will improve my productivity but I'm going behind fixing these issues for last ten days. Can anyone please help me.

Looks like I have time travalled to 2015 to have this kind of display text and sluggy mouse.

Any solution please help me to get rid of these both. Kind of losing my productivity on these things rather than focus on other work-related stuff. I have reset my OS thought would help the issue and upgraded and downgraded. Now on Catalina.

System report :- 
Intel Iris Plus Graphics:

  Chipset Model:    Intel Iris Plus Graphics
  Type: GPU
  Bus:  Built-In
  VRAM (Dynamic, Max):  1536 MB
  Vendor:   Intel
  Revision ID:  0x0007
  Metal:    Supported, feature set macOS GPUFamily2 v1
Colour LCD:
  Display Type: Built-In Retina LCD
  Resolution:   2560x1600 Retina
  Framebuffer Depth:    30-Bit Colour (ARGB2101010)
  Mirror:   On
  Mirror Status:    Hardware Mirror
  Online:   Yes
  Automatically Adjust Brightness:  No
  Connection Type:  Internal
DELL P2719H:
  Resolution:   1920x1080 (1080p FHD - Full High Definition)
  UI Looks like:    1920 x 1080 @ 60 Hz
  Framebuffer Depth:    30-Bit Colour (ARGB2101010)
  Main Display: Yes
  Mirror:   On
  Mirror Status:    Master Mirror
  Online:   Yes
  Rotation: Supported
  Automatically Adjust Brightness:  No
  Connection Type:  Thunderbolt/DisplayPort
  • Have you installed the Logitech drivers? The reason the screen is blurry is because it is twice the size of your built-in screen yet half the resolution, so it's going to be ¼ as sharp [or 4 times more fuzzy] – Tetsujin Aug 23 '20 at 6:49
  • No I haven't installed logitech drivers. What is the way to correct it. Should I go for 4k moniters to resolve this issue. It is a 6 month old monitor – Varshini Aug 23 '20 at 11:11
  • Go to Logitech, get their drivers. Adding a higher res screen will stop your 'fuzziness' but at a cost of display speed. I'd be tempted towards a 2k screen rather than 4k, but you'll need to try things out & see which you prefer. – Tetsujin Aug 23 '20 at 16:37
  • Also, don’t use HDMI, use DisplayPort instead. You shouldn’t need Logitech drivers. If you disconnect the Dell monitor, does the lag go away? – Allan Aug 23 '20 at 17:07
  • Yes Allan -- If I disconnect I dont see a lag in mouse movement without external monitor – Varshini Aug 23 '20 at 17:19

The issue that you’re having is that you driving a massive monitor on what amounts to an “entry level” MacBook Pro. That particular 13” MacBook Pro doesn’t have a discrete GPU so it has to share all of the graphics processing with the CPU. Additionally, it’s using up to 1.5GB of your system RAM as video memory. You can see this when you disconnect the external monitor, the mouse no longer lags; it’s because the CPU isn’t working hard to drive that monitor.

The reality here you’d most likely do better with a higher end MacBook Air than you would a low end MacBook Pro. (IMO) the reason you get a “Pro” is for the discrete video and higher memory capacity. If you’re not getting the Pro with the AMD Radeon GPU and the maximum memory, you’re not getting full value.

If you are within the return window, I’d return it and either get a MacBook Pro with a GPU (even a used one) or get a higher spec MacBook Air and save some money.

Lagging mouse

You shouldn’t need native Logitech drivers to make your mouse not lag. If you don’t have them, your Mac will use the standard USB HID device drivers from Apple and it will behave like a generic 3 or 5 button mouse. The additional software from Logitech is merely for all the special customizations that Logitech brings to the table. The fact that the mouse performance returns to normal when you remove the external display confirms that it’s not a mouse driver issue.

Cables & Connections

Your HDMI cable isn’t going to make things better in terms of blur or color or mouse lagginess. The signal(s) that go over these cables are digital (1s and 0s) meaning you can introduce a ton of noise on the cable and it will still be a digital signal at the end. Cables quality matters in terms of build quality (how it flexes, how the ends were molded, if the pins are not shorted, etc.) I recommend high quality cables to protect your equipment and ensure a reliable connection, not to fix display quality issues because, if it didn’t have the required bandwidth (met the HDMI spec in question) you wouldn’t get the resolution and frame rate that you’re getting. Blurriness is a factor of the wrong resolution for your particular monitor.

You should use a quality DisplayPort cable instead of converting to HDMI. If you notice, your “Connection Type” is Thunderbolt/DisplayPort (last line of your system report), but you’re using HDMI. This means you’re converting from the native DisplayPort signal to HDMI; this can introduce video issues. I’m a staunch proponent of not converting signals and sticking to DisplayPort. You Dell monitor supports DisplayPort so I would go with that first and if you must go HDMI, use an active adapter.

TL;DR - Possible Fixes

  • Connect monitor via DisplayPort and not HDMI. Not having to convert a signal is inherently more efficient and more reliable. The Dell P2719H accepts DisplayPort as an input.

  • If possible, get a MacBook Pro with a discrete GPU (if within the return window). The 2020 13” MacBook Pro with 1.7GHz CPU uses the 8th Gen. Intel Core processor where as the 2020 MacBook Air uses the 10th gen. The latter being more efficient for less money.

  • Downscale your monitor to no larger than 22” FHD display. You’re driving two displays, one of them a massive 27” with nothing but integrated graphics. The less your CPU has to render, the more efficient it will be.

  • I'm with you on everything else, but that Dell is only a 1080p screen. It's going to be about as 'kind' as could be on a low-end GPU. At 27" that's going to be pretty soft, even with the best connectivity. – Tetsujin Aug 23 '20 at 18:59
  • I thought that Dell was a 2K screen (1920x1080). Maybe I looked up the wrong one. – Allan Aug 23 '20 at 19:11
  • It is 1920x1080, which I'd consider "1k" if I had to give it a moniker other than just "Full HD" I'd call 2560x1440 "2k". [I'm aware the "k" monikers are all designed to confuse the user ;) – Tetsujin Aug 23 '20 at 19:14
  • You’re right...2K is 2560x14xx.. 1K or maybe more accurately “not quite 2K” because it’s definitely more than HD. Display resolution marketing names and USB-C specifications...can they make it any more convoluted? – Allan Aug 23 '20 at 19:23
  • Wow. Detailed Answer. I bought MBP 2020 13" mainly for the portable case. I didn't know that i wouldn't be making value out of it. I chose MBP 10th Gen over 8th Gen just because it is the latest processor having more battery life and performance improvement. Sorry for being noob. It is just a month and return period is over. – Varshini Aug 29 '20 at 6:05

How is your HDMI cable connected to your USB-C on the MBP side? I had similar issues and realised that certain combinations of HDMI or HP Display port cables in conjunction with cheap Ali-express converters to USB-C resulted in either a blurred external monitor or even sometimes in the MBP monitor being blurred and the external monitor being perfectly clear.

So if you have the chance, try using different cable combos, just to see if it makes a difference.

  • This one I have ordered based on the good ratings it has in Amazon amazon.in/gp/product/B0825C59SV/… So the sluggy mouse also will go if I change to display port cable Currently in use USB hub for my Macbook :- amazon.in/EKSA-Upgraded-Aluminum-Thunderbolt-Delivery/dp/… – Varshini Aug 23 '20 at 11:13
  • Video cables have nothing to do with a mouse. Lag - whether it’s your mouse or an app - is because of the CPU not having enough resources. Different combos of video cables aren’t going to change anything with respect to the CPU not being able to render things fast enough. – Allan Aug 23 '20 at 18:34

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