diff --git a/spacy/tokens/span.pyx b/spacy/tokens/span.pyx
index 48c6053c1..7087ba986 100644
--- a/spacy/tokens/span.pyx
+++ b/spacy/tokens/span.pyx
@@ -218,10 +218,12 @@ cdef class Span:
         return Underscore(Underscore.span_extensions, self,
                           start=self.c.start_char, end=self.c.end_char)
 
-    def as_doc(self, *, bint copy_user_data=False):
+    def as_doc(self, *, bint copy_user_data=False, array_head=None, array=None):
         """Create a `Doc` object with a copy of the `Span`'s data.
 
         copy_user_data (bool): Whether or not to copy the original doc's user data.
+        array_head (tuple): `Doc` array attrs, can be passed in to speed up computation.
+        array (ndarray): `Doc` as array, can be passed in to speed up computation.
         RETURNS (Doc): The `Doc` copy of the span.
 
         DOCS: https://spacy.io/api/span#as_doc
@@ -229,8 +231,10 @@ cdef class Span:
         words = [t.text for t in self]
         spaces = [bool(t.whitespace_) for t in self]
         cdef Doc doc = Doc(self.doc.vocab, words=words, spaces=spaces)
-        array_head = self.doc._get_array_attrs()
-        array = self.doc.to_array(array_head)
+        if array_head is None:
+            array_head = self.doc._get_array_attrs()
+        if array is None:
+            array = self.doc.to_array(array_head)
         array = array[self.start : self.end]
         self._fix_dep_copy(array_head, array)
         # Fix initial IOB so the entities are valid for doc.ents below.
diff --git a/website/docs/api/span.md b/website/docs/api/span.md
index 9212f957d..48e310979 100644
--- a/website/docs/api/span.md
+++ b/website/docs/api/span.md
@@ -303,6 +303,10 @@ not been implemeted for the given language, a `NotImplementedError` is raised.
 
 Create a new `Doc` object corresponding to the `Span`, with a copy of the data.
 
+When calling this on many spans from the same doc, passing in a precomputed
+array representation of the doc using the `array_head` and `array` args can save
+time.
+
 > #### Example
 >
 > ```python
@@ -312,10 +316,12 @@ Create a new `Doc` object corresponding to the `Span`, with a copy of the data.
 > assert doc2.text == "New York"
 > ```
 
-| Name             | Description                                                   |
-| ---------------- | ------------------------------------------------------------- |
-| `copy_user_data` | Whether or not to copy the original doc's user data. ~~bool~~ |
-| **RETURNS**      | A `Doc` object of the `Span`'s content. ~~Doc~~               |
+| Name             | Description                                                                                                          |
+| ---------------- | -------------------------------------------------------------------------------------------------------------------- |
+| `copy_user_data` | Whether or not to copy the original doc's user data. ~~bool~~                                                        |
+| `array_head`     | Precomputed array attributes (headers) of the original doc, as generated by `Doc._get_array_attrs()`. ~~Tuple~~      |
+| `array`          | Precomputed array version of the original doc as generated by [`Doc.to_array`](/api/doc#to_array). ~~numpy.ndarray~~ |
+| **RETURNS**      | A `Doc` object of the `Span`'s content. ~~Doc~~                                                                      |
 
 ## Span.root {#root tag="property" model="parser"}