--- a/package.json	Tue Feb 11 21:34:28 2020 -0800
+++ b/package.json	Tue Feb 11 21:44:06 2020 -0800
@@ -24,7 +24,7 @@
     "@rollup/plugin-commonjs": "^11.0.1",
     "@rollup/plugin-node-resolve": "^7.0.0",
     "@rollup/plugin-replace": "^2.3.0",
-    "@types/jest": "^24.0.25",
+    "@types/jest": "^24.9.0",
     "@types/rollup-plugin-postcss": "^2.0.0",
     "jest": "^24.9.0",
     "node-globals": "^0.1.5",
@@ -35,6 +35,6 @@
     "stylus": "^0.54.7",
     "ts-jest": "^24.3.0",
     "tslib": "^1.10.0",
-    "typescript": "^3.7.4"
+    "typescript": "^3.7.5"
   }
 }

--- a/pnpm-lock.yaml	Tue Feb 11 21:34:28 2020 -0800
+++ b/pnpm-lock.yaml	Tue Feb 11 21:44:06 2020 -0800
@@ -18,11 +18,11 @@
   rollup: 1.29.0
   rollup-plugin-node-builtins: 2.1.2
   rollup-plugin-postcss: 2.0.3
-  rollup-plugin-typescript2: 0.25.3_rollup@1.29.0+typescript@3.7.4
+  rollup-plugin-typescript2: 0.25.3_rollup@1.29.0+typescript@3.7.5
   stylus: 0.54.7
   ts-jest: 24.3.0_jest@24.9.0
   tslib: 1.10.0
-  typescript: 3.7.4
+  typescript: 3.7.5
 lockfileVersion: 5.1
 packages:
   /@babel/code-frame/7.8.3:
@@ -6020,7 +6020,7 @@
       node: '>=6'
     resolution:
       integrity: sha512-d12oKl6za/GGXmlytzVPzzTdPCKgti/Kq2kNhtfm5vv9hkNbyrTvizMBm6zZ5rRWX/sIWl3znjIJ8xy6Hofoeg==
-  /rollup-plugin-typescript2/0.25.3_rollup@1.29.0+typescript@3.7.4:
+  /rollup-plugin-typescript2/0.25.3_rollup@1.29.0+typescript@3.7.5:
     dependencies:
       find-cache-dir: 3.2.0
       fs-extra: 8.1.0
@@ -6028,7 +6028,7 @@
       rollup: 1.29.0
       rollup-pluginutils: 2.8.1
       tslib: 1.10.0
-      typescript: 3.7.4
+      typescript: 3.7.5
     dev: true
     peerDependencies:
       rollup: '>=1.26.3'
@@ -6754,13 +6754,13 @@
     dev: true
     resolution:
       integrity: sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=
-  /typescript/3.7.4:
+  /typescript/3.7.5:
     dev: true
     engines:
       node: '>=4.2.0'
     hasBin: true
     resolution:
-      integrity: sha512-A25xv5XCtarLwXpcDNZzCGvW2D1S3/bACratYBx2sax8PefsFhlYmkQicKHvpYflFS8if4zne5zT5kpJ7pzuvw==
+      integrity: sha512-/P5lkRXkWHNAbcJIiHPfRoKqyd7bsyCma1hZNUGfn20qm64T6ZBlrzprymeu918H+mB/0rIg2gGK/BXkhhYgBw==
   /umd/3.0.3:
     dev: true
     hasBin: true
@@ -7079,7 +7079,7 @@
   '@rollup/plugin-commonjs': ^11.0.1
   '@rollup/plugin-node-resolve': ^7.0.0
   '@rollup/plugin-replace': ^2.3.0
-  '@types/jest': ^24.0.25
+  '@types/jest': ^24.9.0
   '@types/jsonld': ^1.5.1
   '@types/n3': ^1.1.5
   '@types/rollup-plugin-postcss': ^2.0.0
@@ -7096,4 +7096,4 @@
   stylus: ^0.54.7
   ts-jest: ^24.3.0
   tslib: ^1.10.0
-  typescript: ^3.7.4
+  typescript: ^3.7.5

--- a/src/graph_view.ts	Tue Feb 11 21:34:28 2020 -0800
+++ b/src/graph_view.ts	Tue Feb 11 21:44:06 2020 -0800
@@ -4,6 +4,7 @@
 const { namedNode } = DataFactory;
 
 import { SuffixLabels } from "./suffixLabels";
+import { Quad_Object } from "n3";
 // import ns from 'n3/src/IRIs';
 // const { rdf } = ns;
 const rdf = {

--- a/src/index.ts	Tue Feb 11 21:34:28 2020 -0800
+++ b/src/index.ts	Tue Feb 11 21:44:06 2020 -0800
@@ -1,13 +1,13 @@
+import { PolymerElement, html } from "@polymer/polymer";
 import { customElement, property, computed } from "@polymer/decorators";
-import { N3Store } from "n3";
-import { PolymerElement, html } from "@polymer/polymer";
 import { render } from "lit-html";
 
+import { N3Store, Store } from "n3";
+
 import { GraphView } from "./graph_view";
 import { StreamedGraphClient } from "./streamed_graph_client";
-import { Store } from "n3";
+import style from "./style.styl";
 
-import style from "./style.styl";
 export * from "./graph_queries";
 
 export interface VersionedGraph {

--- a/src/streamed_graph_client.ts	Tue Feb 11 21:34:28 2020 -0800
+++ b/src/streamed_graph_client.ts	Tue Feb 11 21:44:06 2020 -0800
@@ -11,6 +11,7 @@
   onStatus: (msg: string) => void;
   onGraphChanged: () => void;
   store: N3Store;
+  _deletedCount: number = 0;
   events!: EventSource;
   constructor(
     eventsUrl: string,
@@ -41,6 +42,11 @@
     //     });
   }
 
+  _vacuum() {
+    // workaround for the growing _ids map
+    this.store = new Store(this.store.getQuads(null, null, null, null));
+  }
+
   reconnectOnWake() {
     // it's not this, which fires on every mouse-in on a browser window, and doesn't seem to work for screen-turned-back-on
     //window.addEventListener('focus', function() { this.connect(eventsUrl); }.bind(this));
@@ -97,8 +103,16 @@
   async patchGraph(patchJson: string) {
     var patch = JSON.parse(patchJson).patch;
 
-    await eachJsonLdQuad(patch.deletes, this.store.removeQuad.bind(this.store));
+    await eachJsonLdQuad(patch.deletes, quad => {
+      this.store.removeQuad(quad);
+      this._deletedCount++;
+    });
     await eachJsonLdQuad(patch.adds, this.store.addQuad.bind(this.store));
+
+    if (this._deletedCount > 100) {
+      this._vacuum();
+      this._deletedCount = 0;
+    }
   }
 
   close() {