diff --git a/.changeset/chatty-nails-end.md b/.changeset/chatty-nails-end.md
new file mode 100644
index 00000000000..3071dc0628e
--- /dev/null
+++ b/.changeset/chatty-nails-end.md
@@ -0,0 +1,8 @@
+---
+"@primer/components": patch
+---
+
+Allow Overlay height and width to be set through AnchoredOverlay
+Allow ActionList Items to supply an `id` instead of `key`
+Performance imporvements when ActionList is not given any groups
+Enable focus zone as soon as AnchoredOverlay opens
diff --git a/src/ActionList/Item.tsx b/src/ActionList/Item.tsx
index e6c505a7120..e4cdabca36a 100644
--- a/src/ActionList/Item.tsx
+++ b/src/ActionList/Item.tsx
@@ -8,7 +8,7 @@ import styled from 'styled-components'
 /**
  * Contract for props passed to the `Item` component.
  */
-export interface ItemProps extends React.ComponentPropsWithoutRef<'div'>, SxProp {
+export interface ItemProps extends Omit<React.ComponentPropsWithoutRef<'div'>, 'id'>, SxProp {
   /**
    * Primary text which names an `Item`.
    */
@@ -69,6 +69,11 @@ export interface ItemProps extends React.ComponentPropsWithoutRef<'div'>, SxProp
    * Callback that will trigger both on click selection and keyboard selection.
    */
   onAction?: (item: ItemProps, event: React.MouseEvent<HTMLDivElement> | React.KeyboardEvent<HTMLDivElement>) => void
+
+  /**
+   * An id associated with this item.  Should be unique between items
+   */
+  id?: number | string
 }
 
 const getItemVariant = (variant = 'default', disabled?: boolean) => {
@@ -180,6 +185,7 @@ export function Item(itemProps: Partial<ItemProps> & {item?: ItemInput}): JSX.El
     onKeyPress,
     children,
     onClick,
+    id,
     ...props
   } = itemProps
 
@@ -215,6 +221,7 @@ export function Item(itemProps: Partial<ItemProps> & {item?: ItemInput}): JSX.El
       variant={variant}
       aria-selected={selected}
       {...props}
+      data-id={id}
       onKeyPress={keyPressHandler}
       onClick={clickHandler}
     >
diff --git a/src/ActionList/List.tsx b/src/ActionList/List.tsx
index 48a9290aa09..a7fe1183bd4 100644
--- a/src/ActionList/List.tsx
+++ b/src/ActionList/List.tsx
@@ -1,4 +1,4 @@
-import React from 'react'
+import React, {useMemo} from 'react'
 import type {AriaRole} from '../utils/types'
 import {Group, GroupProps} from './Group'
 import {Item, ItemProps} from './Item'
@@ -137,14 +137,8 @@ export function List(props: ListProps): JSX.Element {
    */
   const renderItem = (itemProps: ItemInput, item: ItemInput) => {
     const ItemComponent = ('renderItem' in itemProps && itemProps.renderItem) || props.renderItem || Item
-    return (
-      <ItemComponent
-        {...itemProps}
-        key={itemProps.key || uniqueId()}
-        sx={{...itemStyle, ...itemProps.sx}}
-        item={item}
-      />
-    )
+    const key = itemProps.key ?? itemProps.id?.toString() ?? uniqueId()
+    return <ItemComponent {...itemProps} key={key} sx={{...itemStyle, ...itemProps.sx}} item={item} />
   }
 
   /**
@@ -153,10 +147,11 @@ export function List(props: ListProps): JSX.Element {
   let groups: (GroupProps | (Partial<GroupProps> & {renderItem?: typeof Item; renderGroup?: typeof Group}))[] = []
 
   // Collect rendered `Item`s into `Group`s, avoiding excess iteration over the lists of `items` and `groupMetadata`:
+  const singleGroupId = useMemo(uniqueId, [])
 
   if (!isGroupedListProps(props)) {
     // When no `groupMetadata`s is provided, collect rendered `Item`s into a single anonymous `Group`.
-    groups = [{items: props.items?.map(item => renderItem(item, item)), groupId: uniqueId()}]
+    groups = [{items: props.items?.map(item => renderItem(item, item)), groupId: singleGroupId}]
   } else {
     // When `groupMetadata` is provided, collect rendered `Item`s into their associated `Group`s.
 
diff --git a/src/AnchoredOverlay/AnchoredOverlay.tsx b/src/AnchoredOverlay/AnchoredOverlay.tsx
index 4596cfdba54..fa76121e4a6 100644
--- a/src/AnchoredOverlay/AnchoredOverlay.tsx
+++ b/src/AnchoredOverlay/AnchoredOverlay.tsx
@@ -1,5 +1,5 @@
 import React, {useCallback, useEffect, useMemo, useRef, useState} from 'react'
-import Overlay from '../Overlay'
+import Overlay, {OverlayProps} from '../Overlay'
 import {useFocusTrap} from '../hooks/useFocusTrap'
 import {useFocusZone} from '../hooks/useFocusZone'
 import {useAnchoredPosition, useRenderForcingRef} from '../hooks'
@@ -9,7 +9,7 @@ function stopPropagation(event: React.UIEvent) {
   event.stopPropagation()
 }
 
-export interface AnchoredOverlayProps {
+export interface AnchoredOverlayProps extends Pick<OverlayProps, 'height' | 'width'> {
   /**
    * A custom function component used to render the anchor element.
    * Will receive the selected text as `children` prop when an item is activated.
@@ -36,7 +36,15 @@ export interface AnchoredOverlayProps {
  * An `AnchoredOverlay` provides an anchor that will open a floating overlay positioned relative to the anchor.
  * The overlay can be opened and navigated using keyboard or mouse.
  */
-export const AnchoredOverlay: React.FC<AnchoredOverlayProps> = ({renderAnchor, children, open, onOpen, onClose}) => {
+export const AnchoredOverlay: React.FC<AnchoredOverlayProps> = ({
+  renderAnchor,
+  children,
+  open,
+  onOpen,
+  onClose,
+  height,
+  width
+}) => {
   const anchorRef = useRef<HTMLElement>(null)
   const [overlayRef, updateOverlayRef] = useRenderForcingRef<HTMLDivElement>()
   const [focusType, setFocusType] = useState<null | 'anchor' | 'list'>(open ? 'list' : null)
@@ -98,7 +106,7 @@ export const AnchoredOverlay: React.FC<AnchoredOverlayProps> = ({renderAnchor, c
     return position && {top: `${position.top}px`, left: `${position.left}px`}
   }, [position])
 
-  useFocusZone({containerRef: overlayRef, disabled: !open || focusType !== 'list' || !position})
+  useFocusZone({containerRef: overlayRef, disabled: !open || !position})
   useFocusTrap({containerRef: overlayRef, disabled: !open || focusType !== 'list' || !position})
 
   return (
@@ -123,6 +131,8 @@ export const AnchoredOverlay: React.FC<AnchoredOverlayProps> = ({renderAnchor, c
           visibility={position ? 'visible' : 'hidden'}
           onMouseDown={stopPropagation}
           onClick={stopPropagation}
+          height={height}
+          width={width}
           {...overlayPosition}
         >
           {children}