Inconsistant WiFi page fetch time from local server

I have got my NodeMCU working well now connecting to my local server. The one thing I still need to work out is the inconsistency of the time it takes to fetch a page from the server. Mostly it takes 5ms but sometimes it spikes up to anything between 50ms or 150ms and very occasionally 3600ms.

I put a load over various sized capacitors on the power line so that shouldn’t be causing the issue. Is there a way to add a timeout to client.connect() so if it takes longer then 20ms it stops and retries the connection? For my application to work I need it to consistently take less then 90ms per request.

#include <ESP8266WiFi.h>
 
char ssid[] = "virginmedia54841";
char pass[] = "ljksdfli30";

const char* host = "192.168.0.27";
IPAddress server(192,168,0,27);

WiFiClient client;

void setup() {
  Serial.begin(115200);
  delay(100);
  
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  
  WiFi.begin(ssid, pass);  
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }  
  Serial.println("Connected to wifi");
}
 
void loop() {
  unsigned long testStartTime = millis();

  if (client.connect(server, 80)) {
    client.print(String("GET ") + "/index.php HTTP/1.1\r\n" +
               "Host: " + host + "\r\n" + 
               "User-Agent: ArduinoWiFi/1.1" + 
               "Connection: close\r\n\r\n");
    client.println();
  } else {
    Serial.println("connection failed");
  }

  Serial.println(millis() - testStartTime);
  client.stop();
  delay(100);
}