Include rollup-plugin-progress to see what is making thing slow

(bundling big .json files)

config/rollup.config.dev.js

@@ -3,6 +3,7 @@ import commonjs from '@rollup/plugin-commonjs';
 import includePaths from 'rollup-plugin-includepaths';
 import json from '@rollup/plugin-json';
 import nodeResolve from '@rollup/plugin-node-resolve';
+import progress from 'rollup-plugin-progress';
 
 
 // The "dev" build includes all modules in a single bundle - for now
@@ -19,6 +20,7 @@ export default {
     strict: false
   },
   plugins: [
+    progress(),
     includePaths({
       paths: ['node_modules/d3/node_modules'],  // npm2 or windows
       include: {

config/rollup.config.legacy.js

@@ -3,6 +3,7 @@ import buble from '@rollup/plugin-buble';
 import commonjs from '@rollup/plugin-commonjs';
 import includePaths from 'rollup-plugin-includepaths';
 import json from '@rollup/plugin-json';
+import progress from 'rollup-plugin-progress';
 import nodeResolve from '@rollup/plugin-node-resolve';
 
 
@@ -20,6 +21,7 @@ export default {
     strict: false
   },
   plugins: [
+    progress(),
     includePaths({
       paths: ['node_modules/d3/node_modules'],  // npm2 or windows
       include: {

config/rollup.config.stats.js

@@ -3,6 +3,7 @@ import commonjs from '@rollup/plugin-commonjs';
 import includePaths from 'rollup-plugin-includepaths';
 import json from '@rollup/plugin-json';
 import nodeResolve from '@rollup/plugin-node-resolve';
+import progress from 'rollup-plugin-progress';
 import visualizer from 'rollup-plugin-visualizer';
 
 
@@ -19,6 +20,7 @@ export default {
     strict: false
   },
   plugins: [
+    progress(),
     includePaths({
       paths: ['node_modules/d3/node_modules'],  // npm2 or windows
       include: {

package.json

@@ -99,6 +99,7 @@
     "request": "^2.88.0",
     "rollup": "~1.29.1",
     "rollup-plugin-includepaths": "~0.2.3",
+    "rollup-plugin-progress": "^1.1.1",
     "rollup-plugin-visualizer": "~3.3.1",
     "shelljs": "^0.8.0",
     "shx": "^0.3.0",