diff --git a/fastfield_codecs/src/column.rs b/fastfield_codecs/src/column.rs
index 7848cf544..05e49a405 100644
--- a/fastfield_codecs/src/column.rs
+++ b/fastfield_codecs/src/column.rs
@@ -1,5 +1,7 @@
 use std::ops::Range;
 
+use crate::ColumnIter;
+
 pub trait Column<T = u64> {
     /// Return the value associated to the given idx.
     ///
@@ -16,8 +18,12 @@ pub trait Column<T = u64> {
     ///
     /// May panic if `range.end()` is greater than
     /// the segment's `maxdoc`.
-    fn get_range(&self, range: Range<u64>) -> Box<dyn Iterator<Item = T> + '_> {
-        Box::new(range.map(|idx| self.get_val(idx)))
+    #[inline]
+    fn get_range(&self, range: Range<u64>) -> ColumnIter<'_, Self, T>
+    where
+        Self: Sized,
+    {
+        ColumnIter::new(self, range)
     }
 
     /// Returns the minimum value for this fast field.
diff --git a/fastfield_codecs/src/lib.rs b/fastfield_codecs/src/lib.rs
index 602c7fda0..d923938c4 100644
--- a/fastfield_codecs/src/lib.rs
+++ b/fastfield_codecs/src/lib.rs
@@ -4,6 +4,8 @@ extern crate more_asserts;
 
 use std::io;
 use std::io::Write;
+use std::marker::PhantomData;
+use std::ops::Range;
 
 use common::BinarySerializable;
 use ownedbytes::OwnedBytes;
@@ -112,6 +114,41 @@ impl<'a> Column for &'a [u64] {
     }
 }
 
+pub struct ColumnIter<'a, C: Column<I>, I> {
+    column: &'a C,
+    end_pos: u64,
+    current_pos: u64,
+    _phantom: PhantomData<I>,
+}
+
+impl<'a, C: Column<I>, I> ColumnIter<'a, C, I> {
+    #[inline]
+    pub fn new(col: &'a C, range: Range<u64>) -> Self {
+        let current_pos = range.start;
+        Self {
+            column: col,
+            end_pos: range.end,
+            current_pos,
+            _phantom: PhantomData,
+        }
+    }
+}
+
+impl<'a, C: Column<I>, I> Iterator for ColumnIter<'a, C, I> {
+    type Item = I;
+
+    #[inline]
+    fn next(&mut self) -> Option<Self::Item> {
+        if self.current_pos < self.end_pos {
+            let val = self.column.get_val(self.current_pos);
+            self.current_pos += 1;
+            Some(val)
+        } else {
+            None
+        }
+    }
+}
+
 impl Column for Vec<u64> {
     fn get_val(&self, position: u64) -> u64 {
         self[position as usize]
diff --git a/src/fastfield/mod.rs b/src/fastfield/mod.rs
index fc0049665..a57dd12be 100644
--- a/src/fastfield/mod.rs
+++ b/src/fastfield/mod.rs
@@ -982,6 +982,67 @@ mod bench {
     use super::*;
     use crate::directory::{CompositeFile, Directory, RamDirectory, WritePtr};
     use crate::fastfield::tests::generate_permutation_gcd;
+    use crate::schema::{NumericOptions, Schema};
+    use crate::Document;
+
+    fn multi_values(num_docs: usize, vals_per_doc: usize) -> Vec<Vec<u64>> {
+        let mut vals = vec![];
+        for _i in 0..num_docs {
+            let mut block = vec![];
+            for j in 0..vals_per_doc {
+                block.push(j as u64);
+            }
+            vals.push(block);
+        }
+
+        vals
+    }
+
+    #[bench]
+    fn bench_multi_value_fflookup(b: &mut Bencher) {
+        let num_docs = 100_000;
+
+        let path = Path::new("test");
+        let directory: RamDirectory = RamDirectory::create();
+        {
+            let options = NumericOptions::default().set_fast(Cardinality::MultiValues);
+            let mut schema_builder = Schema::builder();
+            let field = schema_builder.add_u64_field("field", options);
+            let schema = schema_builder.build();
+
+            let write: WritePtr = directory.open_write(Path::new("test")).unwrap();
+            let mut serializer = CompositeFastFieldSerializer::from_write(write).unwrap();
+            let mut fast_field_writers = FastFieldsWriter::from_schema(&schema);
+            for block in &multi_values(num_docs, 3) {
+                let mut doc = Document::new();
+                for val in block {
+                    doc.add_u64(field, *val);
+                }
+                fast_field_writers.add_document(&doc);
+            }
+            fast_field_writers
+                .serialize(&mut serializer, &HashMap::new(), None)
+                .unwrap();
+            serializer.close().unwrap();
+        }
+        let file = directory.open_read(&path).unwrap();
+        {
+            let fast_fields_composite = CompositeFile::open(&file).unwrap();
+            let data_idx = fast_fields_composite.open_read_with_idx(*FIELD, 0).unwrap();
+            let idx_reader = DynamicFastFieldReader::<u64>::open(data_idx).unwrap();
+
+            let data_vals = fast_fields_composite.open_read_with_idx(*FIELD, 1).unwrap();
+            let vals_reader = DynamicFastFieldReader::<u64>::open(data_vals).unwrap();
+            let fast_field_reader = MultiValuedFastFieldReader::open(idx_reader, vals_reader);
+            b.iter(|| {
+                let mut sum = 0u64;
+                for i in 0u32..num_docs as u32 {
+                    sum += fast_field_reader.get_vals(i).sum::<u64>();
+                }
+                sum
+            });
+        }
+    }
 
     #[bench]
     fn bench_intfastfield_linear_veclookup(b: &mut Bencher) {
diff --git a/src/fastfield/multivalued/reader.rs b/src/fastfield/multivalued/reader.rs
index 8c3dea9ab..d1291e9fb 100644
--- a/src/fastfield/multivalued/reader.rs
+++ b/src/fastfield/multivalued/reader.rs
@@ -18,7 +18,9 @@ pub struct MultiValuedFastFieldReader<Item: FastValue> {
     vals_reader: DynamicFastFieldReader<Item>,
 }
 
-impl<Item: FastValue> MultiValuedFastFieldReader<Item> {
+impl<Item: FastValue> MultiValuedFastFieldReader<Item>
+where DynamicFastFieldReader<Item>: Column<Item>
+{
     pub(crate) fn open(
         idx_reader: DynamicFastFieldReader<u64>,
         vals_reader: DynamicFastFieldReader<Item>,
@@ -41,7 +43,7 @@ impl<Item: FastValue> MultiValuedFastFieldReader<Item> {
 
     /// Returns the array of values associated to the given `doc`.
     #[inline]
-    pub fn get_vals(&self, doc: DocId) -> Box<dyn Iterator<Item = Item> + '_> {
+    pub fn get_vals(&self, doc: DocId) -> impl Iterator<Item = Item> + '_ {
         let range = self.range(doc);
         self.vals_reader.get_range(range)
     }
diff --git a/src/fastfield/reader.rs b/src/fastfield/reader.rs
index 685488995..585cb59b9 100644
--- a/src/fastfield/reader.rs
+++ b/src/fastfield/reader.rs
@@ -40,40 +40,39 @@ impl<Item: FastValue> DynamicFastFieldReader<Item> {
         mut bytes: OwnedBytes,
         codec_type: FastFieldCodecType,
     ) -> crate::Result<DynamicFastFieldReader<Item>> {
-        let reader = match codec_type {
-            FastFieldCodecType::Bitpacked => {
-                DynamicFastFieldReader::Bitpacked(BitpackedCodec::open_from_bytes(bytes)?.into())
-            }
-            FastFieldCodecType::Linear => {
-                DynamicFastFieldReader::Linear(LinearCodec::open_from_bytes(bytes)?.into())
-            }
-            FastFieldCodecType::BlockwiseLinear => DynamicFastFieldReader::BlockwiseLinear(
-                BlockwiseLinearCodec::open_from_bytes(bytes)?.into(),
-            ),
-            FastFieldCodecType::Gcd => {
-                let codec_type = FastFieldCodecType::deserialize(&mut bytes)?;
-                match codec_type {
-                    FastFieldCodecType::Bitpacked => DynamicFastFieldReader::BitpackedGCD(
-                        open_gcd_from_bytes::<BitpackedCodec>(bytes)?.into(),
-                    ),
-                    FastFieldCodecType::Linear => DynamicFastFieldReader::LinearGCD(
-                        open_gcd_from_bytes::<LinearCodec>(bytes)?.into(),
-                    ),
-                    FastFieldCodecType::BlockwiseLinear => {
-                        DynamicFastFieldReader::BlockwiseLinearGCD(
-                            open_gcd_from_bytes::<BlockwiseLinearCodec>(bytes)?.into(),
-                        )
-                    }
-                    FastFieldCodecType::Gcd => {
-                        return Err(DataCorruption::comment_only(
+        let reader =
+            match codec_type {
+                FastFieldCodecType::Bitpacked => DynamicFastFieldReader::Bitpacked(
+                    BitpackedCodec::open_from_bytes(bytes)?.into(),
+                ),
+                FastFieldCodecType::Linear => {
+                    DynamicFastFieldReader::Linear(LinearCodec::open_from_bytes(bytes)?.into())
+                }
+                FastFieldCodecType::BlockwiseLinear => DynamicFastFieldReader::BlockwiseLinear(
+                    BlockwiseLinearCodec::open_from_bytes(bytes)?.into(),
+                ),
+                FastFieldCodecType::Gcd => {
+                    let codec_type = FastFieldCodecType::deserialize(&mut bytes)?;
+                    match codec_type {
+                        FastFieldCodecType::Bitpacked => DynamicFastFieldReader::BitpackedGCD(
+                            open_gcd_from_bytes::<BitpackedCodec>(bytes)?.into(),
+                        ),
+                        FastFieldCodecType::Linear => DynamicFastFieldReader::LinearGCD(
+                            open_gcd_from_bytes::<LinearCodec>(bytes)?.into(),
+                        ),
+                        FastFieldCodecType::BlockwiseLinear => {
+                            DynamicFastFieldReader::BlockwiseLinearGCD(
+                                open_gcd_from_bytes::<BlockwiseLinearCodec>(bytes)?.into(),
+                            )
+                        }
+                        FastFieldCodecType::Gcd => return Err(DataCorruption::comment_only(
                             "Gcd codec wrapped into another gcd codec. This combination is not \
                              allowed.",
                         )
-                        .into())
+                        .into()),
                     }
                 }
-            }
-        };
+            };
         Ok(reader)
     }
 
diff --git a/src/indexer/merger.rs b/src/indexer/merger.rs
index 31a3cfcf8..f394751dd 100644
--- a/src/indexer/merger.rs
+++ b/src/indexer/merger.rs
@@ -578,6 +578,7 @@ impl IndexMerger {
             stats: FastFieldStats,
         }
         impl<'a> Column for FieldIndexAccessProvider<'a> {
+            #[inline]
             fn get_val(&self, doc: u64) -> u64 {
                 self.offsets[doc as usize]
             }