diff --git a/src/solidlsp/language_servers/rust_analyzer.py b/src/solidlsp/language_servers/rust_analyzer.py
index 2e222b5a8..83e3de8ff 100644
--- a/src/solidlsp/language_servers/rust_analyzer.py
+++ b/src/solidlsp/language_servers/rust_analyzer.py
@@ -505,9 +505,19 @@ def _get_initialize_params(repository_absolute_path: str) -> InitializeParams:
                 "showUnlinkedFileNotification": True,
                 "showDependenciesExplorer": True,
                 "assist": {"emitMustUse": False, "expressionFillDefault": "todo"},
-                "cachePriming": {"enable": True, "numThreads": 0},
+                # rustback lightweight patch: serena's symbol tools don't need
+                # rust-analyzer's eager whole-workspace+deps cache priming, nor a
+                # re-index on every cargo metadata / target/ change. On large,
+                # actively-built Rust workspaces these drove rust-analyzer to
+                # 40+ GB RSS and re-indexed on every external `cargo build`.
+                # Disabling them keeps symbol navigation working at a fraction of
+                # the memory. NOTE: checkOnSave is intentionally left enabled below
+                # because serena's get_diagnostics_for_file relies on flycheck
+                # (`cargo check`) for Rust diagnostics. (Upstream: expose these as
+                # a config knob / a "lightweight" RA profile.)
+                "cachePriming": {"enable": False, "numThreads": 0},
                 "cargo": {
-                    "autoreload": True,
+                    "autoreload": False,
                     "buildScripts": {
                         "enable": True,
                         "invocationLocation": "workspace",