What You're Actually Looking For
The phrase people search for usually points to a few different things. Some want to find the hidden jokes Rockstar tucked into the game. Others want to enable ultra graphics settings so the game runs as cleanly as possible. The two don't really have a technical connection to each other, but they get lumped together in search results because everyone looking for easter eggs on PC also wants the best visual experience while hunting for them. I've spent years tweaking GTA 5 PC builds. What most people miss is that easter eggs in this game are mostly either scripted events hidden in specific map locations, or visual jokes embedded in the environment. Ultra graphics settings won't make any of them appear or disappear. They'll just make finding them slightly easier because distant details render further out.
Gta 5 Gameplay Easter Eggs Pc Ultra Graphics
Here's the straightforward breakdown of what actually exists and how to access these things on a properly configured PC build. Before hunting for anything, you need the game running at a stable frame rate with high quality settings. Rockstar's RAGE engine handles optimization poorly out of the box. The default settings will choke your CPU even if your GPU can handle the graphical load. My usual approach is to set the graphics API to DirectX 11, cap the frame rate at 60 or 144 depending on your monitor, and disable everything labeled as "very high" on the CPU side while keeping texture streaming and shadow quality above normal. I ran into a specific issue last year where enabling ultra graphics and trying to trigger the UFO sighting near Mount Chiliad would cause the game to stutter so badly the event wouldn't fire properly. The trigger for that easter egg has a timing window, and frame drops knock you out of it. The workaround was switching to an older Nvidia driver version from around 2023 rather than the latest one, which somehow restored proper CPU-GPU sync on my particular hardware combination. Your mileage will vary depending on whether you're running AMD or Nvidia, but it's worth noting that newer drivers aren't always better for this specific game.
Actual Easter Eggs Worth Finding
The UFO near Mount Chiliad is the most referenced one. You spawn or drive to the peak around 2:00 AM in-game time. The window for it appearing is narrow. If the screen flashes and you see a beam of light, you've found it. You can shoot at it with any weapon. There is no reward other than it being there. The Atlantis submarine is located off the coast near the ruined shipwreck southeast of Vespucci Beach. It's not something you can enter. It's a static environmental joke with a plaque. Most people drive around looking for something interactive that doesn't exist. There is a hidden movie theater entrance inside the building downtown. Drive or walk through the alley behind the cinema. There is a door that looks ordinary but loads a small interior room with screens and seating. It does nothing else.
Get the Full Details

The alien autopsies happen when you hold up a civilian with a gun in specific locations, then wait. The police don't show up normally. Instead, two figures in dark clothing arrive in an unmarked vehicle, grab the civilian, and leave. This only triggers if you have a three-star wanted level and shoot at the person. The timing has to be right. It's finicky.
Settings That Actually Matter for Discovery
When you're trying to spot environmental details, distance scaling and detail distance matter more than texture quality. Set grass and vegetation density to high or ultra. This is where Rockstar hid most of the visual jokes and ambient details. Shadow quality and anti-aliasing don't affect easter egg detection at all. They only affect visual clarity, which is a separate concern. Enable the photo mode cursor if you're doing a systematic sweep of the map. There are Graffito tags hidden across the city that only show up clearly at certain angles and lighting conditions. Ultra graphics won't reveal them. Proper positioning will.
Where This Approach Falls Apart
Ultra graphics on GTA 5 PC will eat VRAM if you push shadow quality and texture resolution too high simultaneously. The game doesn't manage memory well. I've seen crashes on 8GB cards at ultra settings just from driving through downtown during peak activity. If your system has less than 12GB of system RAM, you'll likely experience stuttering regardless of your GPU. The game is fundamentally CPU-bound in certain areas, and ultra settings don't change that bottleneck. If you're primarily interested in the easter eggs and not the visuals, you can drop graphics quality to normal or high and still find everything. The difference is minimal for discovery purposes. Save your GPU headroom for stable framerates instead.

A Note on Cheats and Mods
Some guides suggest using trainer tools or mod menus to unlock content or warp to locations. Those will ban you from GTA Online permanently. The easter eggs listed above are all available in Story Mode without any modifications. Using tools to access them isn't necessary and creates more problems than it solves. If you want the complete list of every hidden detail, the Rockstar Newswire archives from 2013 through 2015 contain developer commentary on several of them. Nothing official has been published since then. The community has documented the rest through years of exploration.