diff --git a/axi/__init__.py b/axi/__init__.py
index d01b1ea..3df6add 100644
--- a/axi/__init__.py
+++ b/axi/__init__.py
@@ -20,6 +20,13 @@ from .planner import Planner
 from .turtle import Turtle
 from .util import draw, reset
 
+from .drawing import (
+    V3_SIZE,
+    V3_BOUNDS,
+    A3_SIZE,
+    A3_BOUNDS,
+)
+
 from .hershey import text, justify_text
 from .hershey_fonts import (
     ASTROLOGY,
diff --git a/axi/device.py b/axi/device.py
index b1733f0..c7773ae 100644
--- a/axi/device.py
+++ b/axi/device.py
@@ -10,7 +10,7 @@ from .paths import path_length
 from .planner import Planner
 from .progress import Bar
 
-TIMESLICE_MS = 20
+TIMESLICE_MS = 10
 
 MICROSTEPPING_MODE = 2
 STEP_DIVIDER = 2 ** (MICROSTEPPING_MODE - 1)
@@ -22,16 +22,16 @@ PEN_UP_POSITION = 60
 PEN_UP_SPEED = 150
 PEN_UP_DELAY = 0
 
-PEN_DOWN_POSITION = 45
+PEN_DOWN_POSITION = 40
 PEN_DOWN_SPEED = 150
 PEN_DOWN_DELAY = 0
 
-ACCELERATION = 6
-MAX_VELOCITY = 1
-CORNER_FACTOR = 0.005*3
+ACCELERATION = 8
+MAX_VELOCITY = 3
+CORNER_FACTOR = 0.005
 
-JOG_ACCELERATION = 8
-JOG_MAX_VELOCITY = 5
+JOG_ACCELERATION = 16
+JOG_MAX_VELOCITY = 8
 
 VID_PID = '04D8:FD92'
 
@@ -105,7 +105,7 @@ class Device(object):
     def move(self, dx, dy):
         self.run_path([(0, 0), (dx, dy)])
 
-    def goto(self, x, y, jog=False):
+    def goto(self, x, y, jog=True):
         # TODO: jog if pen up
         px, py = self.read_position()
         self.run_path([(px, py), (x, y)], jog)
diff --git a/axi/drawing.py b/axi/drawing.py
index eca1d99..c632964 100644
--- a/axi/drawing.py
+++ b/axi/drawing.py
@@ -11,6 +11,12 @@ try:
 except ImportError:
     cairo = None
 
+V3_SIZE = (12, 8.5)
+V3_BOUNDS = (0, 0, 12, 8.5)
+
+A3_SIZE = (16.93, 11.69)
+A3_BOUNDS = (0, 0, 16.93, 11.69)
+
 class Drawing(object):
     def __init__(self, paths=None):
         self.paths = paths or []
@@ -125,6 +131,10 @@ class Drawing(object):
         x1, y1, x2, y2 = self.bounds
         return y2 - y1
 
+    @property
+    def size(self):
+        return (self.width, self.height)
+
     @property
     def all_paths(self):
         result = []
@@ -234,10 +244,12 @@ class Drawing(object):
         return Drawing(paths)
 
     def render(self, scale=109, margin=1, line_width=0.5/25.4,
-            use_axi_bounds=True, show_axi_bounds=True):
+            bounds=None, show_bounds=True,
+            use_axi_bounds=False, show_axi_bounds=False):
         if cairo is None:
             raise Exception('Drawing.render() requires cairo')
-        x1, y1, x2, y2 = self.bounds
+        bounds = bounds or self.bounds
+        x1, y1, x2, y2 = bounds
         if use_axi_bounds:
             x1, y1, x2, y2 = (0, 0, 12, 8.5)
         w = x2 - x1
@@ -259,6 +271,11 @@ class Drawing(object):
             dc.set_line_width(1 / scale)
             dc.rectangle(0, 0, 12, 8.5)
             dc.stroke()
+        if show_bounds:
+            dc.set_source_rgb(0.5, 0.5, 0.5)
+            dc.set_line_width(1 / scale)
+            dc.rectangle(*bounds)
+            dc.stroke()
         dc.set_source_rgb(0, 0, 0)
         dc.set_line_width(line_width)
         for path in self.paths: