Merge 'Fix performance regression in prepare' from Piotr Rżysko

Attempt at fixing https://github.com/tursodatabase/turso/issues/2527.

Reviewed-by: Jussi Saurio <jussi.saurio@gmail.com>

Closes #2532

Cargo.lock

@@ -4233,6 +4233,7 @@ dependencies = [
  "lru",
  "memory-stats",
  "miette",
+ "mimalloc",
  "pack1",
  "parking_lot",
  "paste",

core/Cargo.toml

@@ -98,6 +98,7 @@ env_logger = "0.11.6"
 test-log = { version = "0.2.17", features = ["trace"] }
 lru = "0.14.0"
 sorted-vec = "0.8.6"
+mimalloc = { version = "0.1.46", default-features = false }
 
 [[bench]]
 name = "benchmark"

core/benches/benchmark.rs

@@ -3,6 +3,10 @@ use pprof::criterion::{Output, PProfProfiler};
 use std::{sync::Arc, time::Instant};
 use turso_core::{Database, PlatformIO};
 
+#[cfg(not(target_family = "wasm"))]
+#[global_allocator]
+static GLOBAL: mimalloc::MiMalloc = mimalloc::MiMalloc;
+
 fn rusqlite_open() -> rusqlite::Connection {
     let sqlite_conn = rusqlite::Connection::open("../testing/testing.db").unwrap();
     sqlite_conn