ApocalypsePlease0

Great, but I never used that mod.

During cruise phase, the FMC didn't program in the STAR correctly because it's supposed to enter a "MANUAL" fix after the last dedicated fix on the arrival, so I decided to add a random navaid (LAM in this case) and delete it so it adds a discontinuity between the last STAR navaid and the first navaid of the approach. It did so successfully, but it set my cruise managed speed to 243 IAS in the FPLN page, but the actual speed it went to was 220 IAS. I tried going direct to the next navaid in the sequence, but it didn't help and the speed stayed the same and I had to keep using the selected speed mode. Video for reference:

Nothing has been touched except I turned on auto step climbs early in the flight, and turned them off about 30 minutes prior to noticing all the screens are unresponsive. Aircraft: A350-900 Simulator: FS24 Navdata Method: NAVIGRAPH Specs: 7800X3D, 4070 Ti Super, DDR5 32 GB at 6000 MT/s. WASM Error: KEWRVIDP_PDF_1742165522.pdf

I just flew into SBRJ, RNP V RWY20L, and upon engaging APPR, it seems the FLS got activated and the plane never captured the RNP guidance at all. Now I don't know if maybe I did something wrong, or this is supposed to happen, or the indications are fine but the RNP is just not working at all? Video of the whole arrival and approach for reference. KATLSBRJ_PDF_1741783515.pdf

I initiated a step climb to the OPT FL as initiated on the FMS, from FL380 to FL400, and it took the plane about 10 minutes to climb to it. It was also climbing at M0.81 instead M0.84 given by the FMS. OTHHEKCH_PDF_1741611056.pdf

All the screens froze as soon as I selected the RNVZ36 appr. WSSSVRMM_PDF_1741434873.pdf

If it's realistic, then what's the point of managed speed? I doubt it.

You described what's visible in the video, yes. However, that's not normal behavior and using OP DES is not the solution.

It happens both under 10000 and above 10000, but I noticed it happens more often under 10000, on every flight. Two screenshots taken a few minutes apart at different altitudes:

I've been encountering these lag spikes during cruise on every flight so far. Link to the video: https://drive.google.com/file/d/1b_WoLLBS1VNt6lvDoGsI-POi9LWeHdVN/view?usp=sharing

It happened on 3 flights I did, EDDM-EGLL, EGLL-EDDM, and KORD-KBOS. It was happening when descending in the managed descent mode while using spoilers, it doesn't seem to affect open descent, at least it didn't the one time I tried it. Video: https://drive.google.com/file/d/1Ksf96TMlqlFh4ssE-R0hgkM5Nc-jm65E/view?usp=sharing (download for better quality)

Video of the problem - https://drive.google.com/file/d/1zaVCg1p1cvFZnPqzuFswijVbKm_-BbJr/view?usp=sharing