Bug/Issue [1.4] Extreme lagging in the mines with low health bar

Posting here as I'm on Linux, but it may be a more general issue of course.

Save started in 1.3. This is the first day I've played on 1.4.

A day of thunder so I went to the mines around noon. Started on level 70 and went down. Didn't notice at first, but at some point around level 80 I got a Prismatic Shard drop!! Woot. Ate a bit of food to help deal with foggy bat attack, and almost died (9 HP left). That meant the health bar was squirting blood every which way, which may be related here. This was around midnight, and suddenly the game started to lag like a mother-f. Thankfully I had gone to the top of mines at this point, so it wasn't terribly far back home. Manage to stumble to the mine cart and went to the bus stop, then stumbled back home and eventually got into bed.

I say stumble because the game had maybe one frame every 5 seconds, which meant that each time I moved I had to wait to see where I was, then move again, bumping into walls, fences and whatnot on the way.

The game still lagged when it did the end of day summary, but next day everything seems fine again. I'm therefore guessing it may have something to do with that blood squirting health bar.

Others will have to judge whether the error log is useful, but it does have something towards the end that looks ominous. The timeline is after the lagging started though, as it lagged fiercely in the top level of the mines and all the way back to bed.

Code:

[18:48:56 TRACE game] Warping to FarmHouse
[18:49:37 TRACE SMAPI] Context: before save.
[18:49:42 ERROR SMAPI] Critical app domain exception: System.ExecutionEngineException: Couldn't create thread
  at (wrapper managed-to-native) System.Threading.ThreadPool:RequestWorkerThread ()
  at System.Threading.ThreadPoolWorkQueue.EnsureThreadRequested () <0x41beb010 + 0x00047> in <filename unknown>:0
  at System.Threading.ThreadPoolWorkQueue.Dispatch () <0x41beb3b0 + 0x002cb> in <filename unknown>:0
  at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback () <0x41beb150 + 0x0000b> in <filename unknown>:0
[18:50:15 TRACE SMAPI] Context: after save, starting summer 21 Y2.
[18:50:27 TRACE game] Disconnected: ClosedGame

Attaching the save file too, though I don't know how easy it would be to reproduce given we start from scratch in the morning.

PS: I use only one mod: the UI Info Suite, hence why I have SMAPI installed.


Thank goodness I didn't die though, because that's the first Prismatic Shard I have ever gotten, and it must have come from the 0.05% chance from having gotten to the bottom level. Phew!!


Edit: These are my system specifications

Code:

System:
  Host: Thunderstruck Kernel: 4.15.0-70-generic x86_64 bits: 64
  compiler: gcc v: 7.4.0 Desktop: Cinnamon 4.2.4
  Distro: Linux Mint 19.2 Tina base: Ubuntu 18.04 bionic
Machine:
  Type: Desktop Mobo: MSI model: Z87-G43 (MS-7816) v: 1.0 serial: <filter>
  UEFI: American Megatrends v: 1.11 date: 05/09/2015
CPU:
  Topology: Quad Core model: Intel Core i5-4670K bits: 64 type: MCP
  arch: Haswell rev: 3 L2 cache: 6144 KiB
  flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 27201
  Speed: 800 MHz min/max: 800/3800 MHz Core speeds (MHz): 1: 800 2: 800
  3: 800 4: 800
Graphics:
  Device-1: NVIDIA GK104 [GeForce GTX 770] vendor: Micro-Star MSI
  driver: nvidia v: 440.26 bus ID: 01:00.0
  Display: x11 server: X.Org 1.19.6 driver: nvidia
  unloaded: fbdev,modesetting,nouveau,vesa resolution: 1920x1080~60Hz
  OpenGL: renderer: GeForce GTX 770/PCIe/SSE2 v: 4.6.0 NVIDIA 440.26
  direct render: Yes
Audio:
  Device-1: Intel 8 Series/C220 Series High Definition Audio
  vendor: Micro-Star MSI driver: snd_hda_intel v: kernel bus ID: 00:1b.0
  Device-2: NVIDIA GK104 HDMI Audio vendor: Micro-Star MSI
  driver: snd_hda_intel v: kernel bus ID: 01:00.1
  Sound Server: ALSA v: k4.15.0-70-generic
Network:
  Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet
  vendor: Micro-Star MSI driver: r8169 v: 2.3LK-NAPI port: d000
  bus ID: 03:00.0
  IF: enp3s0 state: up speed: 1000 Mbps duplex: full mac: <filter>
Drives:
  Local Storage: total: 4.15 TiB used: 2.36 TiB (57.0%)
  ID-1: /dev/sda vendor: Kingston model: SH103S3240G size: 223.57 GiB
  ID-2: /dev/sdb vendor: Samsung model: SSD 860 EVO 1TB size: 931.51 GiB
  ID-3: /dev/sdc vendor: Samsung model: SSD 860 EVO 1TB size: 931.51 GiB
  ID-4: /dev/sdd vendor: Seagate model: ST2000VX000-1CU164 size: 1.82 TiB
  ID-5: /dev/sde vendor: Seagate model: ST3320620AS size: 298.09 GiB
Partition:
  ID-1: / size: 218.58 GiB used: 10.27 GiB (4.7%) fs: ext4 dev: /dev/sda2
  ID-2: /home size: 915.89 GiB used: 192.14 GiB (21.0%) fs: ext4
  dev: /dev/sdb1
Sensors:
  System Temperatures: cpu: 29.8 C mobo: 27.8 C gpu: nvidia temp: 34 C
  Fan Speeds (RPM): N/A gpu: nvidia fan: 36%
Info:
  Processes: 209 Uptime: 2h 00m Memory: 15.61 GiB used: 1.38 GiB (8.9%)
  Init: systemd runlevel: 5 Compilers: gcc: 7.4.0 Shell: bash v: 4.4.20
  inxi: 3.0.32