diff --git a/Cargo.lock b/Cargo.lock
index e55c267..dc0e889 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -787,15 +787,6 @@ dependencies = [
  "hashbrown",
 ]
 
-[[package]]
-name = "itertools"
-version = "0.11.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b1c173a5686ce8bfa551b3563d0c2170bf24ca44da99c7ca4bfdab5418c3fe57"
-dependencies = [
- "either",
-]
-
 [[package]]
 name = "itertools"
 version = "0.13.0"
@@ -855,7 +846,7 @@ dependencies = [
  "futures",
  "hdrhistogram",
  "hytra",
- "itertools 0.13.0",
+ "itertools",
  "jemallocator",
  "lazy_static",
  "metrohash",
@@ -1809,7 +1800,7 @@ checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"
 [[package]]
 name = "scylla"
 version = "0.13.0"
-source = "git+https://github.com/pkolaczk/scylla-rust-driver.git?branch=vector#ea914d446d2172d3470f1e4de5fd87d55962b51a"
+source = "git+https://github.com/pkolaczk/scylla-rust-driver.git?branch=vector#f3eb38947ef22581ff7cc368c3f8dff3ed1919a6"
 dependencies = [
  "arc-swap",
  "async-trait",
@@ -1820,7 +1811,7 @@ dependencies = [
  "futures",
  "hashbrown",
  "histogram",
- "itertools 0.11.0",
+ "itertools",
  "lazy_static",
  "lz4_flex",
  "openssl",
@@ -1841,7 +1832,7 @@ dependencies = [
 [[package]]
 name = "scylla-cql"
 version = "0.2.0"
-source = "git+https://github.com/pkolaczk/scylla-rust-driver.git?branch=vector#ea914d446d2172d3470f1e4de5fd87d55962b51a"
+source = "git+https://github.com/pkolaczk/scylla-rust-driver.git?branch=vector#f3eb38947ef22581ff7cc368c3f8dff3ed1919a6"
 dependencies = [
  "async-trait",
  "byteorder",
@@ -1857,7 +1848,7 @@ dependencies = [
 [[package]]
 name = "scylla-macros"
 version = "0.5.0"
-source = "git+https://github.com/pkolaczk/scylla-rust-driver.git?branch=vector#ea914d446d2172d3470f1e4de5fd87d55962b51a"
+source = "git+https://github.com/pkolaczk/scylla-rust-driver.git?branch=vector#f3eb38947ef22581ff7cc368c3f8dff3ed1919a6"
 dependencies = [
  "darling",
  "proc-macro2",
diff --git a/Cargo.toml b/Cargo.toml
index 21af9be..247db0d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -70,7 +70,7 @@ panic = "abort"
 
 [profile.dev-opt]
 inherits = "dev"
-opt-level = 2
+opt-level = 3
 
 [package.metadata.deb]
 name = "latte"
diff --git a/src/scripting/functions.rs b/src/scripting/functions.rs
index 668a024..7efd060 100644
--- a/src/scripting/functions.rs
+++ b/src/scripting/functions.rs
@@ -104,19 +104,25 @@ pub fn uniform(i: i64, min: f64, max: f64) -> VmResult<f64> {
 }
 
 #[rune::function]
-pub fn uniform_vec(i: i64, len: usize, min: f64, max: f64) -> VmResult<Vec<f64>> {
+pub fn uniform_vec(i: i64, len: usize, min: f64, max: f64) -> VmResult<Value> {
     let mut rng = SmallRng::seed_from_u64(i as u64);
-    let vec: Vec<f64> = (0..len).map(|_| rng.gen_range(min..max)).collect();
-    VmResult::Ok(vec)
+    let mut vec = vm_try!(rune::alloc::Vec::try_with_capacity(len));
+    for _ in 0..len {
+        vm_try!(vec.try_push(Value::Float(rng.gen_range(min..max))));
+    }
+    Value::vec(vec)
 }
 
 #[rune::function]
-pub fn normal_vec(i: i64, len: usize, mean: f64, std_dev: f64) -> VmResult<Vec<f64>> {
+pub fn normal_vec(i: i64, len: usize, mean: f64, std_dev: f64) -> VmResult<Value> {
     let mut rng = SmallRng::seed_from_u64(i as u64);
     let distribution =
         vm_try!(Normal::new(mean, std_dev).map_err(|e| VmError::panic(format!("{e}"))));
-    let vec: Vec<f64> = (0..len).map(|_| rng.sample(distribution)).collect();
-    VmResult::Ok(vec)
+    let mut vec = vm_try!(rune::alloc::Vec::try_with_capacity(len));
+    for _ in 0..len {
+        vm_try!(vec.try_push(Value::Float(rng.sample(distribution))));
+    }
+    Value::vec(vec)
 }
 
 /// Generates random blob of data of given length.