diff --git a/bin/solid.pill b/bin/solid.pill
index 243924533..59da577a5 100644
--- a/bin/solid.pill
+++ b/bin/solid.pill
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:11e608f3e5f0dd4860d19131c6c91550514f1e65a2229f9ee6ba0146e9ea7229
-size 9093157
+oid sha256:54e54a61856bd1efed91dd313a0394dfc41a40fb6aefcfa78c03bcdd958d2594
+size 9423845
diff --git a/pkg/arvo/app/dojo.hoon b/pkg/arvo/app/dojo.hoon
index fc9673890..428860f60 100644
--- a/pkg/arvo/app/dojo.hoon
+++ b/pkg/arvo/app/dojo.hoon
@@ -1055,6 +1055,11 @@
     ::  ~&  [%his-clock ler.cal]
     ::  ~&  [%our-clock ven.say]
     =^  dat  say  (~(transceive sole say) cal)
+    ::  speedrun mode
+    ::  =;  res
+    ::    ?.  ?=(%del -.dat)
+    ::      res
+    ::    (he-tab:res +(p.dat))
     ?.  ?&  ?=($del -.dat)
             =(+(p.dat) (lent buf.say))
         ==
diff --git a/pkg/arvo/app/language-server.hoon b/pkg/arvo/app/language-server.hoon
index bf68c1151..186d4bbd4 100644
--- a/pkg/arvo/app/language-server.hoon
+++ b/pkg/arvo/app/language-server.hoon
@@ -12,19 +12,32 @@
   ==
 ::
 +$  lsp-req 
-  $%  [%sync text=@t]
-      [%completion row=@ud col=@ud]
+  $%  [%sync changes=(list change)]
+      [%completion position]
   ==
 ::
-+$  state
-  [buf=@t cache=(tri @tD [hair hoon]) cache-size=@]
++$  change
+  $:  range=(unit range)
+      range-length=(unit @ud)
+      text=@t
+  ==
+::
++$  range
+  $:  start=position
+      end=position
+  ==
+::
++$  position
+  [row=@ud col=@ud]
+::
++$  state  buf=wall
 --
 ::
 |_  [bow=bowl:gall state]
 ::
 ++  this  .
-++  tall-cached
-  (ifix [gay gay] tall:[%*(. vast fat cache)])
+++  tall
+  (ifix [gay gay] tall:vast)
 ::
 ++  prep
   |=  old=(unit state)
@@ -33,7 +46,7 @@
   ?~  old
     :_  this
     [ost.bow %connect / [~ /'~language-server-protocol'] %language-server]~
-  [~ this(+<+< -.u.old)]
+  [~ this(buf u.old)]
 ::
 ::  alerts us that we were bound.
 ::
@@ -44,19 +57,46 @@
 ::
 ::  +poke-handle-http-request: received on a new connection established
 ::
+++  parser
+  =,  dejs:format
+  |^
+  %-  of
+  :~  sync+sync
+      completion+position
+  ==
+  ::
+  ++  sync
+    %-  ar
+    %:  ou
+      range+(uf ~ (pe ~ range))
+      'rangeLength'^(uf ~ (pe ~ ni))
+      text+(un so)
+      ~
+    ==
+  ::
+  ++  range
+    %:  ot
+      start+position
+      end+position
+      ~
+    ==
+  ::
+  ++  position
+    %:  ot
+      line+ni
+      character+ni
+      ~
+    ==
+  --
 ++  poke-handle-http-request
   %-  (require-authorization:app ost.bow move this)
   |=  =inbound-request:eyre
   ^-  (quip move _this)
   ?>  ?=(^ body.request.inbound-request)
   =/  =lsp-req
-    %.  (need (de-json:html q.u.body.request.inbound-request))
-    =,  dejs:format
-    %-  of
-    :~  sync+so
-        completion+(ot line+ni character+ni ~)
-    ==
-  =^  out-jon  +<+.this
+    %-  parser
+    (need (de-json:html q.u.body.request.inbound-request))
+  =^  out-jon  buf
     ?-  -.lsp-req
       %sync        (handle-sync +.lsp-req)
       %completion  (handle-completion +.lsp-req)
@@ -64,54 +104,47 @@
   [[ost.bow %http-response (json-response:app (json-to-octs out-jon))]~ this]
 ::
 ++  handle-sync
-  |=  text=@t
-  =,  enjs:format
-  [*json text cache cache-size]
+  |=  changes=(list change)
+  :-  *json
+  |-  ^-  wall
+  ?~  changes
+    buf
+  ?:  ?|(?=(~ range.i.changes) ?=(~ range-length.i.changes))
+    =/  =wain  (to-wain:format text.i.changes)
+    =.  buf  (turn wain trip)
+    $(changes t.changes)
+  =/  =tape      (zing (join "\0a" buf))
+  =/  start-pos  (get-pos start.u.range.i.changes)
+  =/  end-pos    (get-pos end.u.range.i.changes)
+  =.  tape
+    ;:  weld
+      (scag start-pos tape)
+      (trip text.i.changes)
+      (slag end-pos tape)
+    ==
+  =.  buf  (to-wall tape)
+  $(changes t.changes)
 ::
-::
-++  ingest
-  =|  count=@
-  |=  =wall
-  ^-  (tri @tD [hair hoon])
+++  to-wall
+  |=  =tape
+  ^-  wall
+  %+  roll  (flop tape)
+  |=  [char=@tD =wall]
   ?~  wall
-    [~ ~]
-  =.  count  +(count)
-  ?:  (gth count (sub (lent wall) cache-size))
-    cache
-  =.  cache  $(wall t.wall)
-  ?:  (lth count (sub (sub (lent wall) cache-size) 100))
-    cache
-  ~?  =(0 (mod (lent wall) 100))
-    [%ingest-round (lent wall)]
-  =/  =tape  (zing (join "\0a" wall))
-  =/  mab  (try tape tall-cached)
-  ?~  mab
-    cache
-  ::  ~&  >>>  [- +<]:u.mab
-  (~(put up cache) u.mab)
+    [[char ~] ~]
+  ?:  =('\0a' char)
+    [~ wall]
+  [[char i.wall] t.wall]
 ::
-++  try
-  |*  [los=tape sab=rule]
-  =+  vex=(sab [[1 1] los])
-  ?~  q.vex
-    ~
-  ::  Finished with spaces remaining
-  ::
-  =/  rows  (sub p.p.q.u.q.vex 1)
-  =/  cols
-    ?:  =(0 rows)
-      (sub q.p.q.u.q.vex 1)
-    q.p.q.u.q.vex
-  =/  used-tape
-    (scag (sub (lent los) (lent q.q.u.q.vex)) los)
-  ?.  ?=([?(%32 %10) *] (flop used-tape))
-    ::  ~&  >>>  no=used-tape
-    ~
-  :-  ~
-  ^=  u
-  ::  ~&  >  [p.q.u.q.vex ppv=p.p.vex qpv=q.p.vex tol=(sub (lent los) (lent q.q.u.q.vex)) ll=(lent los) lq=(lent q.q.u.q.vex)]
-  ::  ~&  >>  yes=used-tape
-  [used-tape [rows cols] p.u.q.vex]
+++  get-pos
+  |=  position
+  ^-  @ud
+  ?~  buf
+    0
+  ?:  =(0 row)
+    col
+  %+  add  +((lent i.buf))  ::  +1 because newline
+  $(row (dec row), buf t.buf)
 ::
 ++  safe-sub
   |=  [a=@ b=@]
@@ -121,28 +154,23 @@
 ::
 ++  handle-completion
   |=  [row=@ud col=@ud]
-  ^-  [json @t (tri @tD [hair hoon]) @]
-  =/  =wain  (to-wain:format buf)
-  =/  =wall  (turn wain trip)
-  ::  =?  cache  (lth cache-size (lent wall))   (ingest wall)
-  ::  =.  cache-size  (min (lent wall) (add cache-size 100))
-  =/  =tape  (zing (join "\0a" wall))
-  =/  pos
-    |-  ^-  @ud
-    ?~  wain
-      0
-    ?:  =(0 row)
-      col
-    %+  add  +((met 3 i.wain))  ::  +1 because newline
-    $(row (dec row), wain t.wain)
-  :_  [buf cache cache-size]
-  ~&  >>>  bef=(swag [(safe-sub pos 2) 2] tape)
+  ^-  [json wall]
+  =/  =tape  (zing (join "\0a" buf))
+  =/  pos  (get-pos row col)
+  :_  buf
+  ::  Check if we're on a rune
+  ::
   =/  rune  (swag [(safe-sub pos 2) 2] tape)
   ?:  (~(has by runes:rune-snippet) rune)
     (rune-snippet rune)
+  ::  Don't run on large files because it's slow
+  ::
+  ?:  (gth (lent buf) 1.000)
+    =,  enjs:format
+    (pairs good+b+& result+~ ~)
   ::
   =/  tl
-    (tab-list-tape:auto -:!>(..zuse) pos tape cache)
+    (tab-list-tape:auto -:!>(..zuse) pos tape)
   =,  enjs:format
   ?:  ?=(%| -.tl)
     %-  pairs
diff --git a/pkg/arvo/lib/auto.hoon b/pkg/arvo/lib/auto.hoon
index fc1951808..93a7c9c29 100644
--- a/pkg/arvo/lib/auto.hoon
+++ b/pkg/arvo/lib/auto.hoon
@@ -1,5 +1,6 @@
 ::  Autocomplete for hoon.
 ::
+=/  debug  |
 |%
 +$  ids  (list [=term =type])
 ::
@@ -310,18 +311,18 @@
 ::  Same as +advance-hoon, but takes a position and text directly.
 ::
 ++  tab-list-tape
-  |=  [sut=type pos=@ud code=tape cache=(tri @tD [hair hoon])]
+  |=  [sut=type pos=@ud code=tape]
   ^-  (each (unit ids) [row=@ col=@])
-  ~&  >  %start-magick
+  ~?  >  debug  %start-magick
   =/  magicked  txt:(insert-magic pos code)
-  ~&  >  %start-parsing
+  ~?  >  debug  %start-parsing
   =/  parser
-    (ifix [gay gay] tall:[%*(. vast fat cache)])
+    (ifix [gay gay] tall:vast)
   =/  res  (lily magicked parser)
   ?:  ?=(%| -.res)
-    ~&  >  [%parsing-error p.res]
+    ~?  >  debug  [%parsing-error p.res]
     [%| p.res]
   :-  %&
-  ~&  >  %parsed-good
+  ~?  >  debug  %parsed-good
   ((cury tab-list-hoon sut) p.res)
 --
diff --git a/pkg/arvo/sys/hoon.hoon b/pkg/arvo/sys/hoon.hoon
index 9979bd094..4b11fe2fb 100644
--- a/pkg/arvo/sys/hoon.hoon
+++ b/pkg/arvo/sys/hoon.hoon
@@ -1817,32 +1817,6 @@
     ?~(r.a [~ n.a] $(a r.a))
   --
 ::
-++  up
-  !:
-  =|  a=(tri * *)
-  =*  val-t  ?>(?=(^ val.a) val.a)
-  |@
-  ++  put
-    |*  [b=(list *) c=*]
-    =>  .(b (homo b))
-    |-  ^+  a
-    ?~  b
-      a(val `c)
-    =/  son  (~(gut by kid.a) i.b [~ ~])
-    a(kid (~(put by kid.a) i.b $(a son, b t.b)))
-  ::
-  ++  get
-    |*  b=(list *)
-    =>  .(b (homo b))
-    |-
-    ?~  b
-      [~ val.a]
-    =/  son  (~(get by kid.a) i.b)
-    ?~  son
-      [b val.a]
-    $(a u.son, b t.b)
-  --
-::
 ::::  2o: containers                                    ::
   ::                                                    ::
   ::
@@ -1864,11 +1838,6 @@
   $|  (tree item)
   |=(a=(tree) ~(apt in a))
 ::
-++  tri                                                 ::  trie
-  |$  [key-t val-t]
-  $~  [~ ~]
-  [val=(unit val-t) kid=(map key-t (tri key-t val-t))]
-::
 ::::  2l: container from container                      ::
   ::                                                    ::
   ::
@@ -11967,7 +11936,7 @@
   %*(. vast bug bug, wer wer)                           ::  wer: where we are
 ::
 ++  vast                                                ::  main parsing core
-  =+  [bug=`?`| wer=*path fat=*(tri @tD [hair hoon])]
+  =+  [bug=`?`| wer=*path]
   |%
   ++  gash  %+  cook                                    ::  parse path
               |=  a/(list tyke)  ^-  tyke
@@ -14131,21 +14100,7 @@
         (punt ;~(pfix ;~(pose net tis) wyde))
       ==
     ==
-  ++  tall
-    |=  tub=nail
-    =+  ^-  [t=tape h=(unit [=hair =hoon])]
-        (~(get up fat) q.tub)
-    ?^  h
-      ~&  >  [%tall-cache-hit len=(lent t) hair=hair.u.h]
-      ~?  (lth (lent t) 200)  t=t
-      =/  =hair
-        ?:  =(0 p.hair.u.h)
-          [p=p.p.tub q=(add q.p.tub q.hair.u.h)]
-        [p=(add p.p.tub p.hair.u.h) q=q.hair.u.h]
-      [p=hair q=`u=[p=hoon.u.h q=[p=hair q=t]]]
-    (tale tub)
-  ::
-  ++  tale                                              ::  full tall form
+  ++  tall                                              ::  full tall form
     %+  knee  *hoon
     |.(~+((wart ;~(pose expression:(norm &) long lute apex:(sail &)))))
   ++  till                                              ::  mold tall form