Game stutters heavily, but only in windowed mode

Reference bug ID: 6225410

Date & Time: Jul 17, 11:30 PM
Frequency: 100% when in specific area, looking in specific direction
World name: Faerie
Character name: Rinh Maimhov
Retainer name: N/A
NPC name: N/A
Monster name: N/A
Class/Level: N/A
Party or solo: Solo
In-game time: 8:30 PM
Area and coordinates: Urqopacha X: 32.4, Y: 33.1, Z: 3.2, camera facing W to NW.
Housing: N/A
Steps:
1. Set the game to windowed or borderless windowed mode.
2. Set settings to "maximum" or "desktop (high)".
3. Either enter a location with many players (such as at an A or S rank hunt mark or a world boss FATE) or go to specific locations with the camera pointed a specific direction. The locations I've found that cause this consistently have been the start of Tender Valley and a couple of spots in Urqopacha (see coordinates above for one) with the camera pointed in the general direction of the mountain. This also happens briefly in the transitions between fire/ice/lightning phases of Dawntrail's first extreme trial, as well as the transitions after each boss of the first lv 100 dungeon.
4. Keep the game window focused.

Given all the conditions above, the game stutters heavily. The apparent frame rate is often 1-5 fps, but in extreme cases I have had it freeze for roughly 10 seconds. The game is still running at roughly 60 fps according to the system configuration window, and if I use Nvidia instant replay to capture a recording of the time during the stuttering, the video is perfectly smooth, so it seems like the game is rendering the frames but failing to display them for some reason.

Changing graphics settings to "laptop (standard)" makes the issue happen less frequently. If I focus another window other than the game, or if I set the game to full screen mode, this issue completely goes away. After running the game in full screen mode for a few days, I have not seen the issue happen again.

Here is a video of the issue (taken from my phone, because recording a video using my GPU does not show the issue): https://youtu.be/W5askLyXoDI?si=IM552ME5QJNCQhav

The issue persists after rebooting the client.

Connection Specs
- Type of internet connection/provider: DSL ~500 Mb/s, Spectrum
- Modem maker/model number: Unknown (provided by ISP)

-=-=-=-=-=-=- FFXIV Information -=-=-=-=-=-=-

FINAL FANTASY XIV ONLINE C:\Program Files (x86)\SquareEnix
FINAL FANTASY XIV - A Realm Reborn Language 1 Region 2
ProxyEnable 0
ProxyServer unspecified
ProxyOverride unspecified

-=-=-=-=-=-=- System Information -=-=-=-=-=-=-

SYSTEM_OS Windows 11 Pro 64-bit (6.2, Build 9200) (22621.ni_release.220506-1250)
SYSTEM_CPU 13th Gen Intel(R) Core(TM) i5-13600K (20 CPUs), ~3.5GHz
SYSTEM_CORE_NUM SYSTEM_CORE_LOGIC 20 SYSTEM_CORE_PHYSICS 14
SYSTEM_BIOS 2305
SYSTEM_LANGUAGE English (Regional Setting: English)
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SYSTEM_VIRTUAL_MEMORY 134217727.875MB
SYSTEM_PAGE_FILE 75005.301MB
SYSTEM_STORAGE C:\ SYSTEM_HARDDISK_DRIVE SYSTEM_TOTALDISC_SPACE 1675.336GB SYSTEM_FREEDISC_SPACE 825.141GB
SYSTEM_STORAGE D:\ SYSTEM_HARDDISK_DRIVE SYSTEM_TOTALDISC_SPACE 1676.699GB SYSTEM_FREEDISC_SPACE 382.369GB
SYSTEM_STORAGE I:\ SYSTEM_HARDDISK_DRIVE SYSTEM_TOTALDISC_SPACE 488.923GB SYSTEM_FREEDISC_SPACE 335.605GB
SYSTEM_STORAGE J:\ SYSTEM_HARDDISK_DRIVE SYSTEM_TOTALDISC_SPACE 1907.712GB SYSTEM_FREEDISC_SPACE 437.550GB
SYSTEM_DIRECTX_VERSION DirectX 12
SYSTEM_GRAPHICS NVIDIA GeForce RTX 2060
SYSTEM_GRAPHICS_DEVICE \\.\DISPLAY1
SYSTEM_GRAPHICS_CHIP NVIDIA GeForce RTX 2060
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SYSTEM_GRAPHICS_SHARED_VRAM 32638.650 MB
SYSTEM_GRAPHICS_DAC Integrated RAMDAC
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SYSTEM_GRAPHICS_DRIVER C:\WINDOWS\System32\DriverStore\FileRepository\nv_dispi.inf_amd64_1196b342b24df5d1\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nv_dispi.inf_amd64_1196b342b24df5d1\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nv_dispi.inf_amd64_1196b342b24df5d1\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nv_dispi.inf_amd64_1196b342b24df5d1\nvldumdx.dll
SYSTEM_GRAPHICS_DRIVER_VERSION 32.00.0015.6070
SYSTEM_GRAPHICS_DRIVER_DATE 7/9/2024 19:00:00
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SYSTEM_GRAPHICS NVIDIA GeForce RTX 2060
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SYSTEM_GRAPHICS_SHARED_VRAM 32638.650 MB
SYSTEM_GRAPHICS_DAC Integrated RAMDAC
SYSTEM_GRAPHICS_DISPLAY_MODE 1920 x 1080 (32 bit) (60Hz)
SYSTEM_GRAPHICS_DRIVER C:\WINDOWS\System32\DriverStore\FileRepository\nv_dispi.inf_amd64_1196b342b24df5d1\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nv_dispi.inf_amd64_1196b342b24df5d1\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nv_dispi.inf_amd64_1196b342b24df5d1\nvldumdx.dll,C:\WINDOWS\System32\DriverStore\FileRepository\nv_dispi.inf_amd64_1196b342b24df5d1\nvldumdx.dll
SYSTEM_GRAPHICS_DRIVER_VERSION 32.00.0015.6070
SYSTEM_GRAPHICS_DRIVER_DATE 7/9/2024 19:00:00
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Gamepad Manufacturer: Sony
Gamepad Model Name: Dualshock 4