Rebooting my machine did it.
13 Jun 21:11:06 - [metric] {"level":99,"event":"runtime.memory.rss","value":61960192,"timestamp":1560460266945}
13 Jun 21:11:06 - [metric] {"level":99,"event":"runtime.memory.heapTotal","value":30535680,"timestamp":1560460266946}
13 Jun 21:11:06 - [metric] {"level":99,"event":"runtime.memory.heapUsed","value":25956272,"timestamp":1560460266946}
13 Jun 21:11:21 - [metric] {"level":99,"event":"runtime.memory.rss","value":61800448,"timestamp":1560460281946}
13 Jun 21:11:21 - [metric] {"level":99,"event":"runtime.memory.heapTotal","value":30535680,"timestamp":1560460281947}
13 Jun 21:11:21 - [metric] {"level":99,"event":"runtime.memory.heapUsed","value":25963408,"timestamp":1560460281947}
13 Jun 21:11:36 - [metric] {"level":99,"event":"runtime.memory.rss","value":61386752,"timestamp":1560460296964}
13 Jun 21:11:36 - [metric] {"level":99,"event":"runtime.memory.heapTotal","value":27389952,"timestamp":1560460296966}
13 Jun 21:11:36 - [metric] {"level":99,"event":"runtime.memory.heapUsed","value":23105172,"timestamp":1560460296968}
node-re13 Jun 21:11:51 - [metric] {"level":99,"event":"runtime.memory.rss","value":61386752,"timestamp":1560460311999}
13 Jun 21:11:52 - [metric] {"level":99,"event":"runtime.memory.heapTotal","value":27389952,"timestamp":1560460311999}
13 Jun 21:11:52 - [metric] {"level":99,"event":"runtime.memory.heapUsed","value":23112900,"timestamp":1560460312000}
d stop
node-red start
13 Jun 21:12:07 - [metric] {"level":99,"event":"runtime.memory.rss","value":61386752,"timestamp":1560460327076}
13 Jun 21:12:07 - [metric] {"level":99,"event":"runtime.memory.heapTotal","value":27389952,"timestamp":1560460327077}
13 Jun 21:12:07 - [metric] {"level":99,"event":"runtime.memory.heapUsed","value":23118116,"timestamp":1560460327078}