diff --git a/NEWS.md b/NEWS.md
index aceb1f5..d65af17 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,5 +1,6 @@
 # evaluate (development version)
 
+* `evalute(include_timing)` has been deprecated. I can't find any use of it on GitHub, and it adds substantial code complexity for little gain.
 * `watchout()` is no longer exported; it's really an implementation detail that should never have been leaked to the public interface.
 * `evaluate()` gains an output class (`evaluate_evaluation`/`list`) and a basic print method.
 * `evaluate()` now correctly captures plots created before messages/warnings/errors (#28).
diff --git a/R/eval.R b/R/eval.R
index e3f1ef0..1c6321a 100644
--- a/R/eval.R
+++ b/R/eval.R
@@ -35,10 +35,7 @@
 #'   processes the output from the evaluation. The default simply prints the
 #'   visible return values.
 #' @param filename string overrriding the [base::srcfile()] filename.
-#' @param include_timing if `TRUE`, evaluate will wrap each input
-#'   expression in `system.time()`, which will be accessed by following
-#'   `replay()` call to produce timing information for each evaluated
-#'   command.
+#' @param include_timing Deprecated. 
 #' @import graphics grDevices utils
 evaluate <- function(input,
                      envir = parent.frame(),
@@ -56,6 +53,10 @@ evaluate <- function(input,
   stop_on_error <- as.integer(stop_on_error)
   stopifnot(length(stop_on_error) == 1)
 
+  if (isTRUE(include_timing)) {
+    warning("`evaluate(include_timing)` is deprecated")
+  }
+
   parsed <- parse_all(input, filename, stop_on_error != 2L)
   if (inherits(err <- attr(parsed, 'PARSE_ERROR'), 'error')) {
     source <- new_source(parsed$src, expression(), output_handler$source)
@@ -91,8 +92,7 @@ evaluate <- function(input,
       keep_warning = keep_warning,
       keep_message = keep_message,
       log_warning = log_warning,
-      output_handler = output_handler,
-      include_timing = include_timing
+      output_handler = output_handler
     )
     watcher$check_devices()
 
@@ -120,8 +120,7 @@ evaluate_top_level_expression <- function(exprs,
                                           keep_warning = TRUE,
                                           keep_message = TRUE,
                                           log_warning = FALSE,
-                                          output_handler = new_output_handler(),
-                                          include_timing = FALSE) {
+                                          output_handler = new_output_handler()) {
   stopifnot(is.expression(exprs))
 
   source <- new_source(src, exprs[[1]], output_handler$source)
@@ -190,11 +189,6 @@ evaluate_top_level_expression <- function(exprs,
   } else {
     handle <- force
   }
-  if (include_timing) {
-    timing_fn <- function(x) system.time(x)[1:3]
-  } else {
-    timing_fn <- function(x) {x; NULL}
-  }
 
   user_handlers <- output_handler$calling_handlers
   evaluate_handlers <- list(error = eHandler, warning = wHandler, message = mHandler)
@@ -202,18 +196,13 @@ evaluate_top_level_expression <- function(exprs,
   handlers <- c(user_handlers, evaluate_handlers)
 
   for (expr in exprs) {
-    srcindex <- length(output)
-    time <- timing_fn(
-      ev <- handle(
-        with_handlers(
-          withVisible(eval(expr, envir)),
-          handlers
-        )
+    ev <- handle(
+      with_handlers(
+        withVisible(eval(expr, envir)),
+        handlers
       )
     )
     handle_output(TRUE)
-    if (!is.null(time))
-      attr(output[[srcindex]]$src, 'timing') <- time
 
     if (show_value(output_handler, ev$visible)) {
       # Ideally we'd evaluate the print() generic in envir in order to find
diff --git a/R/replay.R b/R/replay.R
index d431e61..a22e265 100644
--- a/R/replay.R
+++ b/R/replay.R
@@ -41,8 +41,7 @@ replay.character <- function(x) {
 
 #' @export
 replay.source <- function(x) {
-  s <- if (is.null(attr(x$src,'timing'))) '' else render_timing(attr(x$src, 'timing'))
-  cat(paste0(s, line_prompt(x$src)))
+  cat(line_prompt(x$src))
 }
 
 #' @export
@@ -70,38 +69,6 @@ replay.recordedplot <- function(x) {
   print(x)
 }
 
-render_timing <- function(t) {
-  if (max(t) < 0.5) '' else paste0(
-    '[', render_sec(t[[1]] + t[[2]]), # User time + Kernel time
-    ',', render_sec(t[[3]]), # Wall time
-    ']'
-  )
-}
-
-render_sec <- function(s) {
-  if (s < 0.005) return('<5ms')
-  if (s < 1) return(paste0(round(s,2), 's'))
-  if (s < 10) return(paste0(round(s,1), 's'))
-  sec <- round(s,0)
-  if (sec < 120) return(paste0(sec, 's'))
-  min <- floor(sec/60)
-  sec <- sec - min*60
-  if (min < 10) return(paste0(
-    min, 'm', formatC(sec, digits = 0, width = 2, format = "f", flag = "0"), 's'
-  ))
-  min <- min + round(sec/60, 0)
-  if (min < 120) return(paste0(min, 'm'))
-  h <- floor(min/60)
-  min <- min - h * 60
-  if (h < 48) return(paste0(
-    h, 'h', formatC(min, digits = 0, width = 2, format = "f", flag = "0"), 'm'
-  ))
-  d <- floor(h/24)
-  h <- h - d*24
-  return(paste0(d, 'd', h, 'h'))
-}
-
-
 format_condition <- function(x) {
   if (inherits(x, "rlang_warning") || inherits(x, "rlang_error")) {
     format(x)
diff --git a/man/evaluate.Rd b/man/evaluate.Rd
index ba35886..9093d1a 100644
--- a/man/evaluate.Rd
+++ b/man/evaluate.Rd
@@ -58,10 +58,7 @@ visible return values.}
 
 \item{filename}{string overrriding the \code{\link[base:srcfile]{base::srcfile()}} filename.}
 
-\item{include_timing}{if \code{TRUE}, evaluate will wrap each input
-expression in \code{system.time()}, which will be accessed by following
-\code{replay()} call to produce timing information for each evaluated
-command.}
+\item{include_timing}{Deprecated.}
 }
 \description{
 Compare to \code{\link[=eval]{eval()}}, \code{evaluate} captures all of the