other: slightly reduce the CPU time spent for draws (#918)

* other: group all dataset draws in a time chart

We used to draw each data set separately as a new canvas. Now, in one
canvas, we draw all datasets.

Note that this changes how dataset  lines are drawn - rather than
drawing one on top of another, it now draws kinda all at once. This
effect is *kinda* a bit better IMO, but it might also look a bit
more cluttered.

* other: optimize truncate_text

Flamegraphs showed that this area seems to be a bit heavy at times with
some inefficient use of iterators and collection. This change should
hopefully optimize this a bit by reducing some collections or
reallocations.

There can also be some further optimizations with less allocations from
callers.

* Reduce some redundant draws

1 files changed, 2 insertions, 0 deletions

diff --git a/Cargo.toml b/Cargo.toml
index 61f68e20..27b01edf 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -41,6 +41,8 @@ doctest = true
 doc = true
 
 [profile.release]
+# debug = true
+# strip = false
 debug = 0
 strip = "symbols"
 lto = true