diff --git a/src/FsAutoComplete.Core/AdaptiveExtensions.fs b/src/FsAutoComplete.Core/AdaptiveExtensions.fs
index 9b1c91907..1927bc539 100644
--- a/src/FsAutoComplete.Core/AdaptiveExtensions.fs
+++ b/src/FsAutoComplete.Core/AdaptiveExtensions.fs
@@ -541,7 +541,7 @@ module AsyncAVal =
 
 
   /// <summary>
-  /// Returns a new async adaptive value that adaptively applies the mapping fun tion to the given
+  /// Returns a new async adaptive value that adaptively applies the mapping function to the given
   /// adaptive inputs.
   /// </summary>
   let map (mapping: 'a -> CancellationToken -> Task<'b>) (input: asyncaval<'a>) =
@@ -573,7 +573,7 @@ module AsyncAVal =
 
 
   /// <summary>
-  /// Returns a new async adaptive value that adaptively applies the mapping fun tion to the given
+  /// Returns a new async adaptive value that adaptively applies the mapping function to the given
   /// adaptive inputs.
   /// </summary>
   let mapAsync (mapping: 'a -> Async<'b>) (input: asyncaval<'a>) =
@@ -605,7 +605,7 @@ module AsyncAVal =
 
 
   /// <summary>
-  /// Returns a new async adaptive value that adaptively applies the mapping fun tion to the given
+  /// Returns a new async adaptive value that adaptively applies the mapping function to the given
   /// adaptive inputs.
   /// </summary>
   let mapSync (mapping: 'a -> CancellationToken -> 'b) (input: asyncaval<'a>) =
diff --git a/src/FsAutoComplete.Core/Commands.fs b/src/FsAutoComplete.Core/Commands.fs
index c16696af4..bcccc9de4 100644
--- a/src/FsAutoComplete.Core/Commands.fs
+++ b/src/FsAutoComplete.Core/Commands.fs
@@ -1349,7 +1349,7 @@ type Commands
               let text = sourceTextFactory.Create(file, ctn)
 
               state.Files.[file] <-
-                { Touched = DateTime.Now
+                { LastTouched = DateTime.Now
                   Source = text
                   Version = None }
 
diff --git a/src/FsAutoComplete.Core/FileSystem.fs b/src/FsAutoComplete.Core/FileSystem.fs
index 23bc067b1..266165a6f 100644
--- a/src/FsAutoComplete.Core/FileSystem.fs
+++ b/src/FsAutoComplete.Core/FileSystem.fs
@@ -332,7 +332,7 @@ type NamedText(fileName: string<LocalPath>, str: string) =
     startRange, endRange
 
   /// create a new IFSACSourceText for this file with the given text inserted at the given range.
-  member x.ModifyText(m: FSharp.Compiler.Text.Range, text: string) : Result<IFSACSourceText, string> =
+  member x.ModifyText(m: FSharp.Compiler.Text.Range, text: string) : Result<NamedText, string> =
     result {
       let startRange, endRange = x.SplitAt(m)
       let! startText = x[startRange] |> Result.mapError (fun x -> $"startRange -> {x}")
@@ -442,8 +442,7 @@ type NamedText(fileName: string<LocalPath>, str: string) =
     member x.TryGetNextChar p = x.TryGetNextChar p
     member x.PrevPos p = x.PrevPos p
     member x.TryGetPrevChar p = x.TryGetPrevChar p
-
-    member x.ModifyText(r, t) = x.ModifyText(r, t)
+    member x.ModifyText(r, t) = x.ModifyText(r, t) |> Result.map unbox
 
     member x.Item
       with get (m: FSharp.Compiler.Text.Range) = x.Item m
@@ -712,7 +711,6 @@ type ISourceTextFactory =
 type NamedTextFactory() =
   interface ISourceTextFactory with
     member this.Create(fileName: string<LocalPath>, text: string) : IFSACSourceText = NamedText(fileName, text)
-
     member this.Create(fileName: string<LocalPath>, stream: Stream) : ValueTask<IFSACSourceText> =
       valueTask {
         use reader = new StreamReader(stream)
@@ -734,14 +732,15 @@ type RoslynSourceTextFactory() =
       |> ValueTask.FromResult
 
 module File =
-  let getLastWriteTimeOrDefaultNow (path: string) =
+  let getLastWriteTimeOrDefaultNow (path: string<LocalPath>) =
+    let path = UMX.untag path
     if File.Exists path then
       File.GetLastWriteTimeUtc path
     else
       DateTime.UtcNow
 
 type VolatileFile =
-  { Touched: DateTime
+  { LastTouched: DateTime
     Source: IFSACSourceText
     Version: int option }
 
@@ -751,13 +750,12 @@ type VolatileFile =
   member this.SetSource(source) = { this with Source = source }
 
   /// <summary>Updates the Touched value</summary>
-  member this.SetTouched touched = { this with Touched = touched }
+  member this.SetLastTouched touched = { this with LastTouched = touched }
 
   /// <summary>Updates the Touched value attempting to use the file on disk's GetLastWriteTimeUtc otherwise uses DateTime.UtcNow. </summary>
   member this.UpdateTouched() =
-    let path = UMX.untag this.Source.FileName
-    let dt = File.getLastWriteTimeOrDefaultNow path
-    this.SetTouched dt
+    let dt = File.getLastWriteTimeOrDefaultNow this.Source.FileName
+    this.SetLastTouched dt
 
 
   /// <summary>Helper method to create a VolatileFile</summary>
@@ -765,11 +763,11 @@ type VolatileFile =
     let touched =
       match touched with
       | Some t -> t
-      | None -> File.getLastWriteTimeOrDefaultNow source.RawFileName
+      | None -> File.getLastWriteTimeOrDefaultNow source.FileName
 
     { Source = source
       Version = version
-      Touched = touched }
+      LastTouched = touched }
 
 type FileSystem(actualFs: IFileSystem, tryFindFile: string<LocalPath> -> VolatileFile option) =
   let fsLogger = LogProvider.getLoggerByName "FileSystem"
@@ -834,7 +832,7 @@ type FileSystem(actualFs: IFileSystem, tryFindFile: string<LocalPath> -> Volatil
         filename
         |> Utils.normalizePath
         |> tryFindFile
-        |> Option.map (fun f -> f.Touched)
+        |> Option.map (fun f -> f.LastTouched)
         |> Option.defaultWith (fun () -> actualFs.GetLastWriteTimeShim filename)
 
       // fsLogger.debug (
diff --git a/src/FsAutoComplete.Core/State.fs b/src/FsAutoComplete.Core/State.fs
index 622b00d3d..ba99ea8a1 100644
--- a/src/FsAutoComplete.Core/State.fs
+++ b/src/FsAutoComplete.Core/State.fs
@@ -187,7 +187,7 @@ type State =
     |> Option.map (fun opts ->
       x.Files.[file] <-
         { Source = text
-          Touched = DateTime.Now
+          LastTouched = DateTime.Now
           Version = None }
 
       opts)
@@ -219,7 +219,7 @@ type State =
   member x.AddFileTextAndCheckerOptions(file: string<LocalPath>, text: IFSACSourceText, opts, version) =
     let fileState =
       { Source = text
-        Touched = DateTime.Now
+        LastTouched = DateTime.Now
         Version = version }
 
     x.Files.[file] <- fileState
@@ -228,7 +228,7 @@ type State =
   member x.AddFileText(file: string<LocalPath>, text: IFSACSourceText, version) =
     let fileState =
       { Source = text
-        Touched = DateTime.Now
+        LastTouched = DateTime.Now
         Version = version }
 
     x.Files.[file] <- fileState
diff --git a/src/FsAutoComplete/LspServers/AdaptiveFSharpLspServer.fs b/src/FsAutoComplete/LspServers/AdaptiveFSharpLspServer.fs
index b6e439df2..032d8470b 100644
--- a/src/FsAutoComplete/LspServers/AdaptiveFSharpLspServer.fs
+++ b/src/FsAutoComplete/LspServers/AdaptiveFSharpLspServer.fs
@@ -331,7 +331,7 @@ type AdaptiveFSharpLspServer
 
           match parseAndCheck.GetCheckResults.ImplementationFile with
           | Some tast ->
-            do! Async.SwitchToNewThread()
+            // do! Async.SwitchToNewThread()
 
             let res =
               Commands.analyzerHandler (
@@ -843,7 +843,7 @@ type AdaptiveFSharpLspServer
     logger.debug (
       Log.setMessage "TextChanged for file : {fileName} {touched} {version}"
       >> Log.addContextDestructured "fileName" v.FileName
-      >> Log.addContextDestructured "touched" v.Touched
+      >> Log.addContextDestructured "touched" v.LastTouched
       >> Log.addContextDestructured "version" v.Version
     )
 
@@ -936,7 +936,7 @@ type AdaptiveFSharpLspServer
     else
       let inline getSourceFromFile untaggedFile =
         async {
-          do! Async.SwitchToNewThread()
+          // do! Async.SwitchToNewThread()
           use s = File.OpenRead(untaggedFile)
           return! sourceTextFactory.Create(localPath, s) |> Async.AwaitValueTask
         }
@@ -947,7 +947,7 @@ type AdaptiveFSharpLspServer
           let! source = getSourceFromFile untagged |> AsyncAVal.ofAsync
 
           let file =
-            { Touched = lastWriteTime
+            { LastTouched = lastWriteTime
               Source = source
               Version = None }
 
@@ -993,8 +993,6 @@ type AdaptiveFSharpLspServer
   let forceFindOpenFile filePath =
     findFileInOpenFiles filePath |> AVal.force
 
-
-
   let forceFindOpenFileOrRead file =
     asyncOption {
 
@@ -1029,7 +1027,6 @@ type AdaptiveFSharpLspServer
       // flattening openFilesWithChanges makes this check a lot quicker as it's not needing to recalculate each value.
 
       fileshimChanges |> AMap.force |> HashMap.tryFind file
-    // |> Option.orElseWith(fun () -> try (getCachedSourceFiles file |> AsyncAVal.force).Task.GetAwaiter().GetResult()  with _ -> None)
 
     FSharp.Compiler.IO.FileSystemAutoOpens.FileSystem <-
       FileSystem(FSharp.Compiler.IO.FileSystemAutoOpens.FileSystem, filesystemShim)
@@ -1176,7 +1173,7 @@ type AdaptiveFSharpLspServer
         Log.setMessage "Getting typecheck results for {file} - {hash} - {date}"
         >> Log.addContextDestructured "file" file.Source.FileName
         >> Log.addContextDestructured "hash" (file.Source.GetHashCode())
-        >> Log.addContextDestructured "date" (file.Touched)
+        >> Log.addContextDestructured "date" (file.LastTouched)
       )
 
       let! ct = Async.CancellationToken