Opening random Unity project in one minute, profiling dump

dump.txt

Unity 2022.2.0f1 official release.
I get changes from version control, about a dozen files changed (1 commit), then I open Unity.
It takes about one minute to open the project. The project Assets is 23GB (143k files), it also references
some local packages which is 8GB (63k files). Large part of project assets folder is custom data not used
by Unity's import pipeline ("baked" files for game, under StreamingAssets folder, 13GB, 47k files).

63s: InitializeProject
	62s: InitialRefreshV2
		54s: RefreshInternalV2
			30s: ImportOutOfDateAssets
				16s: ScriptingInitializer::FinalizeReload
					16s: SetupLoadedEditorAssemblies
						10s: Packages.Rider.RiderScriptEditor..cctor
							10s: Unity.CodeEditor.CodeEditor.Register
								9s: Packages.Rider.Editor.ProjectGeneration.ProjectGeneration.GenerateAndWriteSolutionAndProjects
									8.5s: GenerateAllAssetProjectParts
										50% of that in GetFileAttributesW
										the rest is a death by a thousand string operations?
									1.0s: SyncProject
						3s: Burst.Editor.BurstLoader..cctor
							RequestSetProtocolVersion -> SendCommandToCompiler -> BurstCompilerService.GetDisassembly -> CacheManager.LoadCache -> AssemblyResolver.ReadModule etc.

					0.6s: XRBuildSystem::DiscoverAllPluginsImpl, calls a bunch of FindAssetImporterAtAssetPath
				14s: AssetImportManager::Import
					10s: ScriptedImporter::GenerateAssetData
						9s: ShaderGraphImporter.OnImportAsset
							9s: BuildAllShaders
								6s: CreateShaderAsset
								2s: ShaderGraph.Generator..cctor
					1.5s: RegisterGraphicsPipelineDependecies
						0.7s: HDRenderPipelineAsset.OnEnable
							0.7s: SetupDLSSFeature
								0.6s: NVSDK_NGX_D3D11_Init_ProjectID
			22s: MonoScriptManager::InitializeRegisteredScripts
				A ton of calls through chain of PPtr<Object> -> PersistentManager::ReadObject -> SerializedFile::InitializeRead -> OpenFileCache::OpenCached -> CreateFileW -> wait on some event/whatever
		8s:  ProcessPostProcessAllAssetNotificationsAndHotReload
			8s: CallPostProcessAllAssetsCallbacks
				5s: RiderScriptEditor.SyncIfNeeded
					5s: GenerateAllAssetProjectParts
						50% of that in GetFileAttributesW
						the rest is a death by a thousand string operations?
				0.6s: TextMeshPro OnPostprocessAllAssets
					LoadAssetAtPath on some Texture2D serialized assets