diff --git a/milli/src/search/new/exact_attribute.rs b/milli/src/search/new/exact_attribute.rs
index 3a31f6a75..bc0195ebc 100644
--- a/milli/src/search/new/exact_attribute.rs
+++ b/milli/src/search/new/exact_attribute.rs
@@ -1,11 +1,10 @@
-use heed::BytesDecode;
 use roaring::{MultiOps, RoaringBitmap};
 
 use super::query_graph::QueryGraph;
 use super::ranking_rules::{RankingRule, RankingRuleOutput};
 use crate::search::new::query_graph::QueryNodeData;
 use crate::search::new::query_term::ExactTerm;
-use crate::{CboRoaringBitmapCodec, Result, SearchContext, SearchLogger};
+use crate::{Result, SearchContext, SearchLogger};
 
 /// A ranking rule that produces 3 disjoint buckets:
 ///
@@ -161,10 +160,8 @@ impl State {
                 // Note: Since the position is stored bucketed in word_position_docids, for queries with a lot of
                 // longer phrases we'll be losing on precision here.
                 let bucketed_position = crate::bucketed_position(position + offset);
-                let word_position_docids = CboRoaringBitmapCodec::bytes_decode(
-                    ctx.get_db_word_position_docids(*word, bucketed_position)?.unwrap_or_default(),
-                )
-                .unwrap_or_default();
+                let word_position_docids =
+                    ctx.get_db_word_position_docids(*word, bucketed_position)?.unwrap_or_default();
                 candidates &= word_position_docids;
                 if candidates.is_empty() {
                     return Ok(State::Empty(query_graph.clone()));
@@ -191,11 +188,7 @@ impl State {
                     // ignore stop words words in phrases
                     .flatten()
                     .map(|word| -> Result<_> {
-                        Ok(ctx
-                            .get_db_word_fid_docids(*word, fid)?
-                            .map(CboRoaringBitmapCodec::bytes_decode)
-                            .unwrap_or_default()
-                            .unwrap_or_default())
+                        Ok(ctx.get_db_word_fid_docids(*word, fid)?.unwrap_or_default())
                     }),
             )?;
             intersection &= &candidates;
diff --git a/milli/src/search/new/query_term/compute_derivations.rs b/milli/src/search/new/query_term/compute_derivations.rs
index 03d92572e..12b8c3832 100644
--- a/milli/src/search/new/query_term/compute_derivations.rs
+++ b/milli/src/search/new/query_term/compute_derivations.rs
@@ -1,17 +1,17 @@
-use fst::automaton::Str;
-use fst::{Automaton, IntoStreamer, Streamer};
-use heed::types::DecodeIgnore;
-use heed::BytesDecode;
 use std::borrow::Cow;
 use std::collections::BTreeSet;
 use std::ops::ControlFlow;
 
+use fst::automaton::Str;
+use fst::{Automaton, IntoStreamer, Streamer};
+use heed::types::DecodeIgnore;
+
 use super::*;
 use crate::search::fst_utils::{Complement, Intersection, StartsWith, Union};
 use crate::search::new::query_term::TwoTypoTerm;
 use crate::search::new::{limits, SearchContext};
 use crate::search::{build_dfa, get_first};
-use crate::{CboRoaringBitmapLenCodec, Result, MAX_WORD_LENGTH};
+use crate::{Result, MAX_WORD_LENGTH};
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub enum NumberOfTypos {
@@ -385,9 +385,7 @@ fn split_best_frequency(
         let left = ctx.word_interner.insert(left.to_owned());
         let right = ctx.word_interner.insert(right.to_owned());
 
-        if let Some(docid_bytes) = ctx.get_db_word_pair_proximity_docids(left, right, 1)? {
-            let frequency =
-                CboRoaringBitmapLenCodec::bytes_decode(docid_bytes).ok_or(heed::Error::Decoding)?;
+        if let Some(frequency) = ctx.get_db_word_pair_proximity_docids_len(left, right, 1)? {
             if best.map_or(true, |(old, _, _)| frequency > old) {
                 best = Some((frequency, left, right));
             }
diff --git a/milli/src/search/new/ranking_rule_graph/exactness/mod.rs b/milli/src/search/new/ranking_rule_graph/exactness/mod.rs
index 55c4497dd..4a3dd6549 100644
--- a/milli/src/search/new/ranking_rule_graph/exactness/mod.rs
+++ b/milli/src/search/new/ranking_rule_graph/exactness/mod.rs
@@ -1,4 +1,3 @@
-use heed::BytesDecode;
 use roaring::RoaringBitmap;
 
 use super::{ComputedCondition, RankingRuleGraphTrait};
@@ -28,7 +27,7 @@ fn compute_docids(
         ExactTerm::Phrase(phrase) => ctx.get_phrase_docids(phrase)?.clone(),
         ExactTerm::Word(word) => {
             if let Some(word_candidates) = ctx.get_db_word_docids(word)? {
-                RoaringBitmapCodec::bytes_decode(word_candidates).ok_or(heed::Error::Decoding)?
+                word_candidates
             } else {
                 return Ok(Default::default());
             }
diff --git a/milli/src/search/new/ranking_rule_graph/proximity/compute_docids.rs b/milli/src/search/new/ranking_rule_graph/proximity/compute_docids.rs
index 07bd102ca..b6f164f16 100644
--- a/milli/src/search/new/ranking_rule_graph/proximity/compute_docids.rs
+++ b/milli/src/search/new/ranking_rule_graph/proximity/compute_docids.rs
@@ -2,7 +2,6 @@
 
 use std::collections::BTreeSet;
 
-use heed::BytesDecode;
 use roaring::RoaringBitmap;
 
 use super::ProximityCondition;
@@ -11,7 +10,7 @@ use crate::search::new::query_term::{Phrase, QueryTermSubset};
 use crate::search::new::ranking_rule_graph::ComputedCondition;
 use crate::search::new::resolve_query_graph::compute_query_term_subset_docids;
 use crate::search::new::SearchContext;
-use crate::{CboRoaringBitmapCodec, Result, RoaringBitmapCodec};
+use crate::Result;
 
 pub fn compute_docids(
     ctx: &mut SearchContext,
@@ -92,9 +91,7 @@ pub fn compute_docids(
                 if universe.is_disjoint(ctx.get_phrase_docids(left_phrase)?) {
                     continue;
                 }
-            } else if let Some(lw_bytes) = ctx.get_db_word_docids(left_word)? {
-                let left_word_docids =
-                    RoaringBitmapCodec::bytes_decode(lw_bytes).ok_or(heed::Error::Decoding)?;
+            } else if let Some(left_word_docids) = ctx.get_db_word_docids(left_word)? {
                 if universe.is_disjoint(&left_word_docids) {
                     continue;
                 }
@@ -155,7 +152,7 @@ fn compute_prefix_edges(
     if let Some(new_docids) =
         ctx.get_db_word_prefix_pair_proximity_docids(left_word, right_prefix, forward_proximity)?
     {
-        let new_docids = &universe & CboRoaringBitmapCodec::deserialize_from(new_docids)?;
+        let new_docids = &universe & new_docids;
         if !new_docids.is_empty() {
             used_left_words.insert(left_word);
             used_right_prefix.insert(right_prefix);
@@ -170,7 +167,7 @@ fn compute_prefix_edges(
             left_word,
             backward_proximity,
         )? {
-            let new_docids = &universe & CboRoaringBitmapCodec::deserialize_from(new_docids)?;
+            let new_docids = &universe & new_docids;
             if !new_docids.is_empty() {
                 used_left_words.insert(left_word);
                 used_right_prefix.insert(right_prefix);
@@ -217,7 +214,7 @@ fn compute_non_prefix_edges(
     if let Some(new_docids) =
         ctx.get_db_word_pair_proximity_docids(word1, word2, forward_proximity)?
     {
-        let new_docids = &universe & CboRoaringBitmapCodec::deserialize_from(new_docids)?;
+        let new_docids = &universe & new_docids;
         if !new_docids.is_empty() {
             used_left_words.insert(word1);
             used_right_words.insert(word2);
@@ -231,7 +228,7 @@ fn compute_non_prefix_edges(
         if let Some(new_docids) =
             ctx.get_db_word_pair_proximity_docids(word2, word1, backward_proximity)?
         {
-            let new_docids = &universe & CboRoaringBitmapCodec::deserialize_from(new_docids)?;
+            let new_docids = &universe & new_docids;
             if !new_docids.is_empty() {
                 used_left_words.insert(word2);
                 used_right_words.insert(word1);
diff --git a/milli/src/search/new/resolve_query_graph.rs b/milli/src/search/new/resolve_query_graph.rs
index ef7adad14..bca8b6268 100644
--- a/milli/src/search/new/resolve_query_graph.rs
+++ b/milli/src/search/new/resolve_query_graph.rs
@@ -3,7 +3,6 @@
 use std::collections::VecDeque;
 
 use fxhash::FxHashMap;
-use heed::BytesDecode;
 use roaring::RoaringBitmap;
 
 use super::interner::Interned;
@@ -12,7 +11,7 @@ use super::query_term::{Phrase, QueryTermSubset};
 use super::small_bitmap::SmallBitmap;
 use super::{QueryGraph, SearchContext};
 use crate::search::new::query_term::LocatedQueryTermSubset;
-use crate::{CboRoaringBitmapCodec, Result, RoaringBitmapCodec};
+use crate::Result;
 
 #[derive(Default)]
 pub struct PhraseDocIdsCache {
@@ -37,7 +36,7 @@ pub fn compute_query_term_subset_docids(
     let mut docids = RoaringBitmap::new();
     for word in term.all_single_words_except_prefix_db(ctx)? {
         if let Some(word_docids) = ctx.get_db_word_docids(word)? {
-            docids |= RoaringBitmapCodec::bytes_decode(word_docids).ok_or(heed::Error::Decoding)?;
+            docids |= word_docids;
         }
     }
     for phrase in term.all_phrases(ctx)? {
@@ -46,8 +45,7 @@ pub fn compute_query_term_subset_docids(
 
     if let Some(prefix) = term.use_prefix_db(ctx) {
         if let Some(prefix_docids) = ctx.get_db_word_prefix_docids(prefix)? {
-            docids |=
-                RoaringBitmapCodec::bytes_decode(prefix_docids).ok_or(heed::Error::Decoding)?;
+            docids |= prefix_docids;
         }
     }
 
@@ -128,8 +126,7 @@ pub fn compute_phrase_docids(
     if words.len() == 1 {
         if let Some(word) = &words[0] {
             if let Some(word_docids) = ctx.get_db_word_docids(*word)? {
-                return RoaringBitmapCodec::bytes_decode(word_docids)
-                    .ok_or(heed::Error::Decoding.into());
+                return Ok(word_docids);
             } else {
                 return Ok(RoaringBitmap::new());
             }
@@ -158,7 +155,7 @@ pub fn compute_phrase_docids(
             {
                 if dist == 0 {
                     match ctx.get_db_word_pair_proximity_docids(s1, s2, 1)? {
-                        Some(m) => bitmaps.push(CboRoaringBitmapCodec::deserialize_from(m)?),
+                        Some(m) => bitmaps.push(m),
                         // If there are no documents for this pair, there will be no
                         // results for the phrase query.
                         None => return Ok(RoaringBitmap::new()),
@@ -169,7 +166,7 @@ pub fn compute_phrase_docids(
                         if let Some(m) =
                             ctx.get_db_word_pair_proximity_docids(s1, s2, dist as u8 + 1)?
                         {
-                            bitmap |= CboRoaringBitmapCodec::deserialize_from(m)?;
+                            bitmap |= m;
                         }
                     }
                     if bitmap.is_empty() {