diff --git a/halyde/apps/help.lua b/halyde/apps/help.lua
index 4bcbca6..29d67b4 100644
--- a/halyde/apps/help.lua
+++ b/halyde/apps/help.lua
@@ -128,7 +128,7 @@ handle:close()
 
 --print(require("serialize")(data, "\t"))
 
--- Halyde terminal doesn't support bold (CSI 1 m) but who cares
+-- Halyde io doesn't support bold (CSI 1 m) but who cares
 
 if data.command then
   terminal.write("\27[1mUsage: \27[0m\n")
diff --git a/halyde/apps/helpdb/echo b/halyde/apps/helpdb/echo
index c850904..6a54326 100644
--- a/halyde/apps/helpdb/echo
+++ b/halyde/apps/helpdb/echo
@@ -1,9 +1,9 @@
 COMMAND echo
 USAGE [TEXT]...
-DESCRIPTION Concatenates and prints text to the terminal.
+DESCRIPTION Concatenates and prints text to the standard output.
 ARG1 TEXT
 ARG1DESCRIPTION Text to print.
 EXAMPLE1 echo test
 EXAMPLE2 echo Hello World!
-EXAMPLE1DESCRIPTION Prints "test" to the terminal.
-EXAMPLE2DESCRIPTION Prints "Hello World!" to the terminal.
+EXAMPLE1DESCRIPTION Prints "test" to the standard output.
+EXAMPLE2DESCRIPTION Prints "Hello World!" to the standard output.
diff --git a/halyde/apps/profile.lua b/halyde/apps/profile.lua
new file mode 100644
index 0000000..8976b5a
--- /dev/null
+++ b/halyde/apps/profile.lua
@@ -0,0 +1,222 @@
+-- TODO: make it somehow not depend on ESC s and ESC u
+local profiler = require("profiler")
+local PAL = {
+  { fg = "\27[31m", bg = "\27[41m" },
+  { fg = "\27[32m", bg = "\27[42m" },
+  { fg = "\27[33m", bg = "\27[43m" },
+  { fg = "\27[34m", bg = "\27[44m" },
+  { fg = "\27[35m", bg = "\27[45m" },
+  { fg = "\27[36m", bg = "\27[46m" },
+  { fg = "\27[37m", bg = "\27[47m" }
+}
+local function pal(i) return PAL[((i - 1) % #PAL) + 1] end
+
+local results = profiler.results()
+if not results then
+  print("No profiling data")
+  return
+end
+
+local radius
+local W = terminal.getResolution()
+if (W == 160) then radius = 20
+elseif (W == 80) then radius = 6
+else radius = 0; PAL = {{fg = "", bg = ""}} end
+
+local MIN_PC = math.min(3, 100 / (radius * 2))
+
+local total = 0
+for _, r in ipairs(results) do total = total + r.time end
+
+local main = {}
+local other = {}
+local ot = 0
+local on_ = 0
+for _, r in ipairs(results) do
+  if r.time / total * 100 >= MIN_PC then
+    table.insert(main, r)
+  else
+    table.insert(other, r)
+    ot = ot + r.time;
+    on_ = on_ + 1
+  end
+end
+if on_ then
+  table.insert(main, { label = "other (" .. on_ .. ")", time = ot })
+end
+
+local START = -math.pi / 2
+local slices = {}
+local cur = START
+for i, m in ipairs(main) do
+  local sw = m.time / total * 2 * math.pi
+  slices[i] = {
+    label = m.label,
+    time = m.time,
+    pc = ("%.1f%%"):format(m.time / total * 100),
+    color = pal(i),
+    sa = cur,
+    sw = sw
+  }
+  cur = cur + sw
+end
+if on_ then slices[#slices].color={fg = "\27[30m", bg = "\27[40m"} end
+
+local ASP = 2
+local cx = radius * ASP
+local cy = radius
+
+local function slice_at(sx, sy)
+  local dy = sy - cy
+  local dx = (sx - cx) / ASP
+  if dx * dx + dy * dy > radius * radius then return nil end
+  local a = math.atan2(dy, dx)
+  if a < START then a = a + 2 * math.pi end
+  for i, sl in ipairs(slices) do
+    if a >= sl.sa and a < sl.sa + sl.sw then return i end
+  end
+  return #slices
+end
+
+local SUB = {
+  { dx = -0.25, dy = -0.375 },
+  { dx = -0.25, dy = -0.125 },
+  { dx = -0.25, dy =  0.125 },
+  { dx =  0.25, dy = -0.375 },
+  { dx =  0.25, dy = -0.125 },
+  { dx =  0.25, dy =  0.125 },
+  { dx = -0.25, dy =  0.375 },
+  { dx =  0.25, dy =  0.375 },
+}
+
+for y = 0, radius * 2 do
+  local lx, rx = math.ceil(cx - radius * ASP), math.floor(cx + radius * ASP)
+
+  terminal.write(("\27[%dC"):format(lx))
+  for x = lx, rx do
+    local c = {}
+    local n = 0
+    for k = 1, 8 do
+      local s = slice_at(x + SUB[k].dx, y + SUB[k].dy)
+      c[k] = s
+      if s then n = n + 1 end
+    end
+
+    if n == 0 then
+      terminal.write("\27[0m ")
+    else
+      local counts = {}
+      local order = {}
+      for k = 1, 8 do
+        if c[k] then
+          local key = c[k]
+          if not counts[key] then
+            counts[key] = 0
+            table.insert(order, key)
+          end
+          counts[key] = counts[key] + 1
+        end
+      end
+      table.sort(order, function(a, b) return counts[a] > counts[b] end)
+      local dom = order[1]
+      local sub = order[2]
+
+      if n == 8 then
+        terminal.write(slices[dom].color.bg)
+        if sub == nil then
+          terminal.write(" ")
+        else
+          local mask = 0
+          for k = 1, 8 do
+            if c[k] == sub then mask = mask + (1 << (k - 1)) end
+          end
+          terminal.write(slices[sub].color.fg)
+          terminal.write(utf8.char(0x2800 + mask))
+        end
+      else
+        local mask = 0
+        for k = 1, 8 do
+          if c[k] == dom then mask = mask + (1 << (k - 1)) end
+        end
+        terminal.write("\27[0m")
+        terminal.write(slices[dom].color.fg)
+        terminal.write(utf8.char(0x2800 + mask))
+      end
+    end
+  end
+  terminal.write('\n')
+end
+
+terminal.write("\27[" .. radius * 2 + 1 .. "A\27[s")
+local function draw_text(col, row, s)
+  terminal.write("\27[u\27[" .. col .. "C\27[" .. row - 1 .. "B" .. s)
+end
+
+terminal.write("\27[0m")
+if radius == 0 then goto tier1gpu end
+for _, sl in ipairs(slices) do
+  local y = math.floor(cy + radius * 0.62 * math.sin(sl.sa + sl.sw / 2) + 0.5)
+
+  local function in_slice(x, row)
+    local a = math.atan2(row - cy, (x - cx) / ASP)
+    if a < START then
+      a = a + 2 * math.pi
+    end
+    return a >= sl.sa and a < sl.sa + sl.sw
+  end
+  local function centered_draw(row, text)
+    local dy = row - cy
+    local half_w = math.sqrt(radius * radius - dy * dy) * ASP
+    local lx, rx = math.ceil(cx - half_w), math.floor(cx + half_w)
+    while lx <= rx and not in_slice(lx, row) do
+      lx = lx + 1
+    end
+    while rx >= lx and not in_slice(rx, row) do
+      rx = rx - 1
+    end
+    local avail = rx - lx + 1
+    if avail < 3 then
+      return
+    end
+    local t = #text > avail and text:sub(1, avail - 3) .. "..." or text
+    local start_x = lx + math.floor((avail - #t) / 2)
+    draw_text(start_x, row, sl.color.bg .. t)
+  end
+  centered_draw(y, sl.label)
+  centered_draw(y + 1, sl.pc)
+end
+::tier1gpu::
+
+local max_w = 0
+for _, sl in pairs(slices) do
+  max_w = math.max(#sl.label + 1, max_w)
+end
+for _, sl in pairs(other) do
+  max_w = math.max(#sl.label + 3, max_w)
+end
+local x = radius * 2 * ASP + 2
+if radius == 0 then x = 0 end
+local cw = W - x - 1
+local suffix_w = 18
+local max_lbl = math.max(4, cw - suffix_w)
+terminal.write("\27[u\27[" .. x .. "C" .. ("\27[0m%" .. max_w .. "s  %9s   %6s"):format("label", "time", "share"))
+terminal.write("\n")
+for _, sl in ipairs(slices) do
+  local lbl = sl.label
+  if #lbl > max_lbl then
+    lbl = sl.label:sub(1, max_lbl - 1) .. "…"
+  end
+  terminal.write("\n\27[" .. x .. "C" .. ("%s%" .. max_w .. "s\27[0m  %9.4fs  %6s"):format(sl.color.bg, lbl, sl.time, sl.pc))
+end
+for _, sl in ipairs(other) do
+  local lbl = sl.label
+  if #lbl > max_lbl - 2 then
+    lbl = sl.label:sub(1, max_lbl - 3) .. "…"
+  end
+  terminal.write("\n\27[" .. x .. "C" .. ("%s%" .. max_w .. "s\27[0m  %9.4fs  %6s"):format(slices[#slices].color.bg, lbl, sl.time, ("%.1f%%"):format(sl.time / total * 100)))
+end
+
+if radius * 2 + 2 > #slices + #other then
+  terminal.write("\27[" .. radius * 2 + 2 .. "B")
+end
+terminal.write("\n")
diff --git a/halyde/apps/test.lua b/halyde/apps/test.lua
new file mode 100644
index 0000000..3cbbb59
--- /dev/null
+++ b/halyde/apps/test.lua
@@ -0,0 +1,15 @@
+for i = 1, 100 do
+   profiler.start("math_work")
+   local x = 0
+   for j = 1, 200000 do x = x + math.sqrt(j) end
+   profiler.stop("math_work")
+
+   profiler.start("string_work")
+   local s = ""
+   for j = 1, 2000 do s = s .. tostring(j) end
+   profiler.stop("string_work")
+ end
+
+for _, r in ipairs(profiler.results()) do
+  print(r.label, r.time)
+end
diff --git a/halyde/kernel/boot.lua b/halyde/kernel/boot.lua
index 4903bf1..ffa6696 100644
--- a/halyde/kernel/boot.lua
+++ b/halyde/kernel/boot.lua
@@ -11,6 +11,7 @@ gpu.bind(screenAddress)
 gpu.setResolution(gpu.maxResolution())
 
 local log = assert(loadfile("/lib/log.lua")(loadfile))
+_G.profiler = assert(loadfile("/lib/profiler.lua")())
 
 log.kernel.info("Bound GPU to screen " .. tostring(screenAddress))
 
@@ -67,10 +68,10 @@ require("/halyde/kernel/datatools.lua") -- If this is not imported BEFORE modloa
 log.kernel.info("Loading modules")
 require("/halyde/kernel/modload.lua")
 
-package.preload("component")
-package.preload("computer")
-package.preload("log")
-package.preload("event")
+local toPreload = { "component", "computer", "log", "event" }
+for _, p in pairs(toPreload) do
+  profiler.profile("pre-loading " .. p, package.preload, p)
+end
 
 local computer = require("computer")
 function wait(seconds)
diff --git a/halyde/kernel/modload.lua b/halyde/kernel/modload.lua
index 6ef1cc9..4d5f569 100644
--- a/halyde/kernel/modload.lua
+++ b/halyde/kernel/modload.lua
@@ -19,8 +19,10 @@ local moduleTypes = {}
 local modulesLoaded = {}
 
 local function loadModule(modName)
+  local stop = profiler.start("loadModule(" .. tostring(modName) .. ")")
   if table.find(modulesLoaded, modName) then
     log.kernel.warn(string.format("[modload: %s] Module was already loaded - skipping", modName))
+    stop()
     return true
   end
 
@@ -28,6 +30,7 @@ local function loadModule(modName)
   if not moduleData then
     log.kernel.warn(string.format("[modload: %s] Could not find module data.", modName))
     table.remove(moduleList, table.find(moduleList, modName))
+    stop()
     return true
   end
   local ready = false
@@ -42,6 +45,7 @@ local function loadModule(modName)
   end
   if not ready then
     log.kernel.info(string.format("[modload: %s] Module not ready - skipping", modName))
+    stop()
     return false
   end
   if type(moduleData.dependencies) == "table" then
@@ -74,16 +78,19 @@ local function loadModule(modName)
           tostring(err or "unknown error")
         )
       )
+      stop()
       return false
     else
       table.insert(modulesLoaded, modName)
       table.remove(moduleList, table.find(moduleList, modName))
     end
   end
+  stop()
   return true
 end
 
 for _, modName in pairs(moduleList) do -- Get all the module types
+  local stop = profiler.start("getting module " .. modName .. ")")
   log.kernel.info(string.format("[modload: %s] Getting data from module", modName))
   local moduleData
   local status, err = pcall(function()
@@ -123,6 +130,7 @@ for _, modName in pairs(moduleList) do -- Get all the module types
     moduleTypes[modName] = moduleData.type -- Not the other way around because there can be multiple modules of the same type, but there can't be multiple entries with the same key
   end
   ::continue::
+  stop()
 end
 
 local function loadAllModules() -- attempt at loading all modules, unless if they're not ready
diff --git a/halyde/kernel/modules/defenv.lua b/halyde/kernel/modules/defenv.lua
index 854f3ef..be0979b 100644
--- a/halyde/kernel/modules/defenv.lua
+++ b/halyde/kernel/modules/defenv.lua
@@ -1,6 +1,6 @@
 local module = {}
 
-module.dependencies = { "terminal" }
+module.dependencies = { "io" }
 
 function module.check()
   return true -- This module should always be loaded
diff --git a/halyde/kernel/modules/terminal.lua b/halyde/kernel/modules/terminal.lua
index 03de7d1..bf5f1d3 100644
--- a/halyde/kernel/modules/terminal.lua
+++ b/halyde/kernel/modules/terminal.lua
@@ -17,9 +17,8 @@ function module.init()
   local event = require("event")
 
   local component = require("component")
-  local computer = require("computer")
   local gpu = component.gpu
-  _G._PUBLIC.terminal = {}
+  _G._PUBLIC.io = {}
 
   local readHistory = {}
   function _PUBLIC.terminal.getHistory(id)
@@ -145,9 +144,6 @@ function module.init()
 
   local ANSIColorPalette = getColorPalette(gpu.maxDepth())
 
-  local expecting_unicode_bytes = 0
-  local unicode_bytes_left = 0
-  local unicode_codepoint = 0
   local cursor = { x = 1, y = 1, X = nil, Y = nil } -- X and Y are managed by ESC s and ESC u
   local printState = 0 -- 0:none 1:in ESC 2:in CSI
   local color = {
@@ -566,7 +562,7 @@ function module.init()
     local args = {...}
     local stringArgs = {}
     for _, arg in pairs(args) do
-      if type(arg)=="table" then
+      if type(arg) == "table" then
         table.insert(stringArgs, serialize(arg))
       elseif tostring(arg) then
         table.insert(stringArgs, tostring(arg))
@@ -815,7 +811,7 @@ function module.init()
 end
 
 function module.exit()
-  _G._PUBLIC.terminal = nil
+  _G._PUBLIC.io = nil
 end
 
 return module
diff --git a/lib/profiler.lua b/lib/profiler.lua
new file mode 100644
index 0000000..94e6148
--- /dev/null
+++ b/lib/profiler.lua
@@ -0,0 +1,35 @@
+local thing = _G._PUBLIC or _G
+thing.__PROFILER_INSTANCE = thing.__PROFILER_INSTANCE or { timers = {} }
+local timers = thing.__PROFILER_INSTANCE.timers
+local profiler = {}
+
+function profiler.start(label, overwrite)
+  thing.__PROFILER_INSTANCE.lastadded = label
+  timers[label] = timers[label] or {}
+  if not timers[label].start or overwrite then
+    timers[label].start = os.clock()
+  end
+  return function() timers[label].time = timers[label].time or os.clock() - timers[label].start end
+end
+
+function profiler.results()
+  local _now = nil
+  local function now()
+    _now = _now or os.clock()
+    return _now
+  end
+  local out = {}
+  for label, t in pairs(timers) do
+    table.insert(out, { label = label, time = t.time or now() - t.start })
+  end
+  table.sort(out, function(a, b) return a.time > b.time end)
+  return out
+end
+
+function profiler.profile(label, func, ...)
+  local stop = profiler.start(label)
+  func(...)
+  stop()
+end
+
+return profiler
diff --git a/webinstall.lua b/webinstall.lua
index 9a565c2..aa3b204 100644
--- a/webinstall.lua
+++ b/webinstall.lua
@@ -1,4 +1,4 @@
-local io = require("io")
+local io = require("terminal")
 local component = require("component")
 if not component.isAvailable("internet") then
   io.stderr.write("This program requires an internet card to run.")