I have a four monitor set-up and DisplayFusion works brilliantly with it. I use the Wallpaper module to display random jpeg images from a specific folder with each monitor displaying different pictures and with different time intervals to minimise the chances of all images changing at once.

What I have noticed if I select the "Load Next Wallpaper Slideshow Image", whether it be from the desktop context menu, a keyboard shortcut, or a titlebar button, there is a delay before the next group of images displays.

I was hoping that using this option would generate an immediate refresh of all 4 displays without any delay.

I have an issue with walpaper changes on widows 11 it loaded the first walpaper and it doesn't load the two walpapers at all on the two monitors I use. I've used it before on another computer build and it worked fine then

issue fixed on two monitors seems a setting in (Windows - Display) features "Annimation" turning the toggel button to "OFF" give displayFusion control again over wallpaper Changes (p.s. this is in windows 11 Pro. might be useful for amaskell999 too

The delay is at least as long as the time set for the next screen to have its wallpaper image updated. So this would be at least one minute.
Sometimes, a single monitor will change its wallpaper image before all four monitors are updated.
However, i can tell that DF has already selected the next image file for each monitor in preparation for the 4 monitor update because using the "Dislay wallpaper image in File Explorer" menu shows the next file to be displayed and not the current image.

yes delays you talk about seem to be longer than expected even if I have three screens it's witin 30 seconds, I'm running a Geforce RTC card and 64md ram on a SATA drive win-11 .. I haven't optermised it yet and still the loads seem quite fluid. maybe if you set them to change background at different intervals it would assist it's display times ( if you don't mind that option ) and it depends where your screens are pluged into I'm guessing having 4 screen your PC has four HDMI ports and mine has only two HAMI ports from the grapics card and the last screen is a HDMI direct from the motherboard, but I only use that screen for reading files AKA WhatsApp chat.
the main screens are either Transpport Fever 2 and next year TF3 when it comes out. or such Sims as RaceRoom Etc is running here on one screen or three. I just need to practice going faster to win $10,000 So they say.
then again having the backgrunds changing is automaticlly happening in the background at those times.
P.S. I'm running all screens at 1920 x 1080 REs.
p.p.s. I have the bacrgound wallpapers set to "fit best and maintain aspect ration ( no cliping )"

My graphics system was a pain to configure. I had an old GeForce 1070 card that could happily run three monitors and a TV in PC mode all at 1920x1080 resolution. But I wanted to upgrade to 4k OLED displays, with an ultra-wide 49" monitor above three 27" 4k monitors. I tried an RTX4070 but discovered it could only run two or three monitors at best. I ended up with two RTX6000 Ada cards to get all four monitors running perfectly. My PC has an Intel Xeon W7 CPU with 24 cores, 128Gb RAM and 9 SSD drives with the system drive running off an ultrafast PCIe5 bus, so my system is no slouch!!!