Unity MonoBehaviour that stops the editor play mode before it's too late

FPSHandbrake.cs

using UnityEngine;
using UnityEngine.Profiling;

namespace KL.Utils {
    
    public class FPSHandbrake : MonoBehaviour {
        private float stopEditorAtFPS = 5;
        private float memoryMaxMB = 1024 * 10;
        private float stopEditorDelay = 10;
        private float stopFrameDurationTreshold = 1;
        private float startFromFrame = 10;

        #if UNITY_EDITOR
        private int killAfterFrames = -1;
        private float timeBelowStopFPS;
        private float lastFrameRealTime;

        void Start() {
            lastFrameRealTime = Time.realtimeSinceStartup;
        }
        
        void Update() {
            if (!UnityEditor.EditorApplication.isPlaying) { return; }
            if (Time.frameCount < startFromFrame) { 
                lastFrameRealTime = Time.realtimeSinceStartup;
                return; 
            }
            var fps = 1f / Time.smoothDeltaTime;
            var t = Time.realtimeSinceStartup;
            var ft = lastFrameRealTime - t;
            lastFrameRealTime = t;
            if (ft > stopFrameDurationTreshold) {
                Debug.LogErrorFormat(
                    "Stopping editor play mode in 10 frames from now because of frame duration: {0:0.00}s > {1:0.00}s", 
                        ft, stopFrameDurationTreshold);
                if (killAfterFrames < 0) {
                    killAfterFrames = 10;
                    return;
                }
            }
            if (killAfterFrames > 0) {
                killAfterFrames -= 1;
                if (killAfterFrames == 0) {
                    UnityEditor.EditorApplication.isPlaying = false;
                }
            }
            if (fps < stopEditorAtFPS) {
                timeBelowStopFPS += Time.deltaTime;
            } else {
                timeBelowStopFPS = 0;
            }
            if (timeBelowStopFPS > stopEditorDelay) {
                Debug.LogErrorFormat(
                    "Stopping editor play mode after running for {0:0.00}s at {1} FPS!", 
                        timeBelowStopFPS, stopEditorAtFPS);
                UnityEditor.EditorApplication.isPlaying = false;
            }
            var mem = MemoryUsedMB();
            if (mem > memoryMaxMB) {
                Debug.LogErrorFormat(
                    "Stopping editor play mode: Memory {0} MB > {1} MB", 
                        mem, memoryMaxMB);
                UnityEditor.EditorApplication.isPlaying = false;
            }
        }

        private float MemoryUsedMB() {
            float m1 = (Profiler.GetTotalAllocatedMemoryLong() / 1024f / 1024f);
            float m2 = (Profiler.GetAllocatedMemoryForGraphicsDriver() / 1024f / 1024f);
            float m3 = (Profiler.GetTotalReservedMemoryLong() / 1024f / 1024f);
            return m1 + m2 + m3;
        }
        #endif
    }
}