From c5130912fd122ce7351ef5530f04b61569e12a88 Mon Sep 17 00:00:00 2001
From: "dak-agent[bot]" <284037069+dak-agent[bot]@users.noreply.github.com>
Date: Thu, 23 Jul 2026 16:29:14 +0000
Subject: [PATCH] fix(backend): widen TPS window to ~3.33 blocks for 300ms
 block time
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The TPS metric summed 2.5 blocks of transaction counts to approximate
one second, on the assumption that average block time is ~400ms
(2.5 * 400ms = 1s). With block time now ~300ms, a 2.5-block window
covers only ~750ms, causing TPS to be under-reported by ~25%.

Track a fourth block and sum ~3.33 blocks (3.33 * 300ms = 1s) so the
metric again approximates one second of throughput.

Co-authored-by: Vukašin Manojlović <8989109+iamvukasin@users.noreply.github.com>
---
 backend/src/lib/server.rs | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/backend/src/lib/server.rs b/backend/src/lib/server.rs
index 57766bd..a3724bb 100644
--- a/backend/src/lib/server.rs
+++ b/backend/src/lib/server.rs
@@ -60,6 +60,7 @@ struct TPSTracker {
     block_1_txs: usize,
     block_2_txs: usize,
     block_3_txs: usize,
+    block_4_txs: usize,
     current_tx_count: usize,
 }
 
@@ -72,15 +73,16 @@ impl TPSTracker {
         self.current_tx_count += 1;
     }
 
-    /// Calculates the TPS over an effective window of 2.5 blocks.
-    /// The formula sums the transaction counts of the two most recent full blocks and half of the newest (partial) block.
-    /// This is because average block time is approximately 400ms; summing 2.5 blocks provides a close approximation of one second.
+    /// Calculates the TPS over an effective window of ~3.33 blocks.
+    /// The formula sums the transaction counts of the three most recent full blocks and one third of the block before them.
+    /// This is because average block time is approximately 300ms; summing 3.33 blocks (3.33 * 300ms) provides a close approximation of one second.
     pub fn get_tps(&mut self) -> usize {
         self.block_1_txs = self.block_2_txs;
         self.block_2_txs = self.block_3_txs;
-        self.block_3_txs = self.current_tx_count;
+        self.block_3_txs = self.block_4_txs;
+        self.block_4_txs = self.current_tx_count;
         self.current_tx_count = 0;
-        self.block_1_txs + self.block_2_txs + (self.block_3_txs / 2)
+        self.block_2_txs + self.block_3_txs + self.block_4_txs + (self.block_1_txs / 3)
     }
 }