diff --git a/build.sbt b/build.sbt
index 23943c0..eaf21d2 100644
--- a/build.sbt
+++ b/build.sbt
@@ -188,3 +188,23 @@ def project(id: String, base: File): Project = {
       scalaVersion := scala212
     )
 }
+
+// compile settings
+ThisBuild / scalacOptions ++= List(
+  "-unchecked",
+  "-deprecation",
+  "-language:_",
+  "-encoding",
+  "UTF-8"
+)
+
+ThisBuild / scalacOptions ++= {
+  if (insideCI.value) {
+    val log = sLog.value
+    log.info("Running in CI, enabling Scala2 optimizer")
+    Seq(
+      "-opt-inline-from:<sources>",
+      "-opt:l:inline"
+    )
+  } else Nil
+}