ruff: Enable PERF rules.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

analytics/lib/fixtures.py

@@ -65,7 +65,7 @@ def generate_time_series_data(
     seed(random_seed)
     noise_scalars = [gauss(0, 1)]
     for i in range(1, length):
-        noise_scalars.append(
+        noise_scalars.append(  # noqa: PERF401 # https://github.com/astral-sh/ruff/issues/6210
             noise_scalars[-1] * autocorrelation + gauss(0, 1) * (1 - autocorrelation)
         )
 

pyproject.toml

@@ -108,6 +108,7 @@ select = [
     "INT", # gettext
     "ISC", # string concatenation
     "N", # naming
+    "PERF", # performance
     "PGH", # pygrep-hooks
     "PIE", # miscellaneous
     "PL", # pylint
@@ -139,6 +140,7 @@ ignore = [
     "E731", # Do not assign a lambda expression, use a def
     "N802", # Function name should be lowercase
     "N806", # Variable in function should be lowercase
+    "PERF203", # `try`-`except` within a loop incurs performance overhead
     "PLC1901", # `s == ""` can be simplified to `not s` as an empty string is falsey
     "PLR0911", # Too many return statements
     "PLR0912", # Too many branches